Granted (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period Document Type Document Type Short-term investments and other, gross realized gains Short Term Investments And Other Gross Realized Gains Represents the gross profit realized on the sale of short term investment and other. State and municipal US States and Political Subdivisions Debt Securities [Member] Bank loan participations: Bank Loan Participations [Abstract] Granted (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross Contingent Liabilities Commitments and Contingencies Disclosure [Text Block] Reserve for losses and loss adjustment expenses Reserve for losses and loss adjustment expenses gross of reinsurance recoverables on unpaid losses and loss adjustment expenses at end of period Liability for Claims and Claims Adjustment Expense Reserve For Losses And Loss Adjustment Expenses [Table] Reserve For Losses And Loss Adjustment Expenses [Table] A table or schedule providing information pertaining to reserve for losses and Loss adjustment expenses. Fair Value Debt Securities, Available-for-sale, Fair Value, Fiscal Year Maturity [Abstract] Short-term investments and other, gross realized losses Short Term Investments And Other Gross Realized Losses Represents the gross loss realized on the sale of short term investment and other. Segments [Axis] Segments [Axis] Vested (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value Significant Unobservable Inputs Level 3 Fair Value, Inputs, Level 3 [Member] After one year through five years Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year One Through Five Insurance licenses and authorities Licensing Agreements [Member] Statistical Measurement [Domain] Statistical Measurement [Domain] Liabilities and Shareholders’ Equity Liabilities and Equity [Abstract] Line of Credit Line of Credit [Member] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Preferred Shares Preferred stock Preferred Stock [Member] Security Exchange Name Security Exchange Name Intangible assets, net Intangible Assets, Net (Excluding Goodwill) Payables to reinsurers Reinsurance Payable Specialty Admitted Insurance Specialty Admitted Insurance [Member] Represents information regarding specialty admitted insurance. Unvested, beginning of period (in dollars per share) Unvested, end of period (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value Fixed maturity securities, gross realized losses Debt Securities, Available-for-sale, Realized Loss Schedule of Business Acquisitions, by Acquisition [Table] Schedule of Business Acquisitions, by Acquisition [Table] Commitments and contingent liabilities Commitments and Contingencies Other invested assets Total other invested assets Other Investments Vesting of RSUs Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures Common share repurchases Payments for Repurchase of Common Stock Assets Assets [Abstract] Investment, Name [Axis] Investment, Name [Axis] Vesting period (in years) Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period Accounting Policies [Abstract] Accounting Policies [Abstract] Vested (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period Loss per share: Earnings Per Share Reconciliation [Abstract] Other Comprehensive Loss Comprehensive Income (Loss) Note [Text Block] Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Retained (deficit) earnings Retained Earnings (Accumulated Deficit) Allowance for uncollectible reinsurance balances Reinsurance Recoverable, Allowance for Credit Loss Entity Address, Country Entity Address, Country Equity securities: Short-term Investments [Abstract] Bank Holding Company Bank Holding Company [Member] Represents information about Bank Holding Company. Summary of Net Realized Gains and Losses on Investments Realized Gain (Loss) on Investments [Table Text Block] Reconciliation of Securities Measured at Fair Value on a Recurring Basis Using Significant Unobservable Inputs Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block] Beginning of period (in shares) End of period (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number Less reclassification adjustment: OCI, Debt Securities, Available-for-Sale, Gain (Loss), before Adjustment, after Tax [Abstract] Unrecognized share based compensation expense Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount Non-employee directors Non-employee Directors [Member] Non-employee Directors [Member] Preferred Shares – 2021 and 2020: $0.00125 par value; 20,000,000 shares authorized; no shares issued and outstanding Preferred Stock, Value, Issued Income Tax Expense Income Tax, Policy [Policy Text Block] U.S. Treasury securities and obligations guaranteed by the U.S. government US Treasury and Government [Member] Total expenses Operating Expenses Other comprehensive loss: Other Comprehensive Income (Loss), Net of Tax [Abstract] Other Comprehensive Income (Loss), Net of Tax [Abstract] Exercisable, end of period (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number BERMUDA BERMUDA Common stock, par value (in dollars per share) Common Stock, Par or Stated Value Per Share Unearned premiums Unearned Premiums Other Operating Expenses [Abstract] Other Operating Expenses and Other Expenses [Abstract] Other Operating Expenses and Other Expenses [Abstract] BBB- or better Standard & Poor's, BBB- or Better Rating [Member] Standard & Poor's, BBB- or Better Rating [Member] Compensation expense under share incentive plans APIC, Share-based Payment Arrangement, Increase for Cost Recognition Measurement Frequency [Domain] Measurement Frequency [Domain] Weighted-average common shares outstanding: Weighted Average Number of Shares Outstanding, Basic [Abstract] Purchases Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases Gross fee income Fee Income Represents amount of fee income . Bank loan participations, at fair value Bank loan participations Fair Value, Option, Loans Held as Assets, Aggregate Fair Value Fair Value, Option, Loans Held as Assets, Aggregate Fair Value Business Acquisition [Axis] Business Acquisition [Axis] Geographical [Domain] Geographical [Domain] Cash dividend declared (in dollars per share) Dividends Payable, Amount Per Share After five years through ten years Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10 Statement [Line Items] Statement [Line Items] Equity securities, gross realized losses Equity Securities, FV-NI, Realized Loss Per share data: Earnings Per Share, Basic and Diluted [Abstract] Purchases Payment To Acquire Bank Loan Participations Represents payment to acquire Bank loan participations. Premiums receivable and agents’ balances, net Premiums and Other Receivables, Net Statement [Table] Statement [Table] Statistical Measurement [Axis] Statistical Measurement [Axis] Credit Facility [Axis] Credit Facility [Axis] After ten years Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 10 Preferred stock, shares issued (in shares) Preferred Stock, Shares Issued Short-term investments, net Payments for (Proceeds from) Short-term Investments Reserve for losses and loss adjustment expenses net of reinsurance recoverables at beginning of period Reserve for losses and loss adjustment expenses net of reinsurance recoverables at end of period Liability for Unpaid Claims and Claims Adjustment Expense, Net Entity Small Business Entity Small Business Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Acquired Intangible Assets [Line Items] Acquired Intangible Assets [Line Items] Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. Senior Debt Debt Disclosure [Text Block] Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] Weighted-average remaining contractual life of options exercisable Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term Assets deposited for securing letters of credit Assets Deposited For Securing Letters Of Credit Represents amount of assets deposited for securing letters of credit. Amendment Flag Amendment Flag Schedule of Reconciliation of Numerator and Denominator of Basic and Diluted Earnings Per Share Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Finite-Lived Intangible Assets, Major Class Name [Domain] Finite-Lived Intangible Assets, Major Class Name [Domain] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] Maximum number of shares available for issuance Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized Schedule of Assets Measured at Fair Value on a Recurring Basis Fair Value, Assets Measured on Recurring Basis [Table Text Block] Number of shares available for grant Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant Senior debt Drawn balance outstanding Long-term Line of Credit Letter of credit 102.5 Million 2013 Facility 2013 Facility [Member] 2013 Facility Net cash (used in) operating activities Net Cash Provided by (Used in) Operating Activities Development on prior year loss reserves Prior years Prior Year Claims and Claims Adjustment Expense Entity Central Index Key Entity Central Index Key Measurement Frequency [Axis] Measurement Frequency [Axis] Financial Instruments [Domain] Financial Instruments [Domain] Underwriting loss Underwriting Profit (Loss) Represents the amount related to underwriting profit (loss) during the period. Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets by Major Class [Axis] Schedule of Carrying Value and Fair Value Fair Value, by Balance Sheet Grouping [Table Text Block] Investment in variable interest entities Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount Fair Value Measurement [Domain] Fair Value Measurement [Domain] Schedule of Gross Carrying Amounts and Accumulated Amortization Schedule of Finite-Lived Intangible Assets [Table Text Block] Residential mortgage-backed Residential Mortgage Backed Fair Value Represents fair value of residential mortgage backed. Fixed maturity securities, 12 months or more, fair value Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer Bank holding companies Bank Holding Companies [Member] Name of the investment category. Geographical [Axis] Geographical [Axis] Subsequent Events Subsequent Events [Text Block] Segments [Domain] Segments [Domain] Fixed maturity securities, available-for-sale, at amortized cost Total fixed maturity securities, Cost or Amortized Cost Debt Securities, Available-for-sale, Amortized Cost Total investments available-for-sale, Gross Unrealized Gains Aggregate net unrealized gain Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax Statement of Cash Flows [Abstract] Statement of Cash Flows [Abstract] Common share equivalents (in shares) Weighted Average Number Diluted Shares Outstanding Adjustment Total gains or losses (realized/unrealized)-Included in earnings Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings Schedule Of Acquired Intangible Assets [Table] Schedule Of Acquired Intangible Assets [Table] Represents the tabular information related to intangible assets acquired in the acquisition. Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Schedule of Summary of Available-for-Sale Investments Schedule of Available-for-sale Securities Reconciliation [Table Text Block] Stockholders' Equity Note [Abstract] Stockholders' Equity Note [Abstract] Amortization of intangible assets Amortization of intangible assets Amortization of Intangible Assets Redemptions Proceeds From Maturities And Repayments Of Other Invested Assets Represents proceeds from maturities and repayments of other invested assets. Number of credit facilities Number of Credit Facilities Number of Credit Facilities Plan Name [Axis] Plan Name [Axis] Other liabilities Other Liabilities Segment Information Segment Reporting Disclosure [Text Block] Vesting of RSUs (in shares) Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures Raiser Raiser [Member] Raiser [Member] Total assets Segment assets Assets Unvested, beginning of period (in shares) Unvested, end of period (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number Short-term investments and other Short Term Investments And Other Gross Realized Gains (Losses) Short Term Investments And Other Gross Realized Gains (Losses) Title of 12(b) Security Title of 12(b) Security Net realized and unrealized gains (losses) on investments in equity securities Equity Securities, FV-NI, Gain (Loss) Subsequent Event Type [Axis] Subsequent Event Type [Axis] Unrealized losses arising during the period, net of U.S. income taxes OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment, after Tax Antidilutive Securities [Axis] Antidilutive Securities [Axis] Equity securities, at cost Equity Securities, FV-NI, Cost U.S. income taxes OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment, Tax Junior subordinated debt Junior subordinated debt Junior Subordinated Debenture Owed to Unconsolidated Subsidiary Trust Bank loan participations Fair Value, Option, Aggregate Differences, Loans and Long-term Receivables Interest expense Interest expense Interest Expense Other income and expenses Other Income And Expenses Represents other income and expenses. Changes in fair values of equity securities Equity Securities, FV-NI, Unrealized Gain (Loss) Summary of Net Unrealized Gains and Losses on Investments Unrealized Gain (Loss) on Investments [Table Text Block] Accrued expenses Accrued Liabilities Contingent Liabilities [Line Items] Contingent Liabilities [Line Items] Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. Commercial mortgage and asset-backed Commercial Mortgage Backed Securities [Member] Total liabilities Liabilities Investment Type [Axis] Investment Type [Axis] Weighted-average period of unrecognized share based compensation expense Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition Fixed maturity securities, fair value Total fair value Debt Securities, Available-for-sale, Unrealized Loss Position Rate of interest Investment Interest Rate Bank loan participations Bank loan participations Bank Loan Participations, Net Gain (Loss) Bank Loan Participations, realized and unrealized net gains (losses) Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Disclosure [Abstract] Quoted Prices in Active Markets for Identical Assets Level 1 Fair Value, Inputs, Level 1 [Member] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] Restricted cash equivalents Restricted cash equivalents at beginning of period Restricted cash equivalents at end of period Amount of collateral held Restricted Cash Equivalents Fixed maturity securities, less than 12 months, fair value Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months Shares Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] Commercial Auto Business Commercial Auto Business [Member] Commercial Auto Business Credit Rating, Standard & Poor's [Axis] Credit Rating, Standard & Poor's [Axis] Common share equivalents (in dollars per share) Common Share Equivalents Earnings Per Share Represents amount of earnings per share of common share equivalents. Fixed maturity securities, gross realized gains Debt Securities, Available-for-sale, Realized Gain Restricted stock unit dividend equivalents Restricted Stock Unit Dividend Equivalents Represents amount of dividend equivalent of RSU's. Additional Paid-in Capital Additional Paid-in Capital [Member] Assets Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] Other assets Other Assets Reinsurance recoverable on paid losses Reinsurance Recoverable for Paid Claims and Claims Adjustments Antidilutive Securities, Name [Domain] Antidilutive Securities, Name [Domain] Asset Class [Axis] Asset Class [Axis] Schedule of Other Invested Assets Other Invested Asset [Table Text Block] Tabular disclosure of other invested assets consisting of private debt and equity investments. Other invested assets: Other Investments [Abstract] Common stock, shares outstanding (in shares) Balance (in shares) Balance (in shares) Common Stock, Shares, Outstanding Number of insurance companies Number Of Insurance Companies This element represents number of insurance companies owned by the entity. Total loss and loss adjustment expense payments Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid Add: Reinsurance recoverables on unpaid losses and loss adjustment expenses at end of period Reinsurance Recoverable for Unpaid Claims and Claims Adjustments, Gross Reinsurance Recoverable for Unpaid Claims and Claims Adjustments, Gross Loss before taxes Pre-tax (income) loss Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Letters of credit facility, amount Letter Of Credit Facility Amount Represents amount of letter of credit facility. Subsequent Event Subsequent Event [Member] Beginning of period (in dollars per share) End of period (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price Amount of letters of credit issued Letters of Credit Outstanding, Amount Common stock, shares authorized (in shares) Common Stock, Shares Authorized Percentage of outstanding shares Business Acquisition, Percentage of Voting Interests Acquired Schedule of Summary of Company's Segment Results Schedule of Segment Reporting Information, by Segment [Table Text Block] Casualty Reinsurance Casualty Reinsurance [Member] Represents information regarding casualty reinsurance. Fair Value Estimate of Fair Value Measurement [Member] Income Statement [Abstract] Income Statement [Abstract] Accumulated Other Comprehensive Income AOCI Attributable to Parent [Member] Short-term investments Other Short-term Investments Schedule of Summary of Available-for-Sale Investments by Contractual Maturity Investments Classified by Contractual Maturity Date [Table Text Block] Schedule of Segment Reporting Information, by Segment [Table] Schedule of Segment Reporting Information, by Segment [Table] Estimates and Assumptions Use of Estimates, Policy [Policy Text Block] Losses and loss adjustment expenses Total incurred losses and loss and adjustment expenses Liability for Unpaid Claims and Claims Adjustment Expense, Incurred Claims Interest income Investment Income, Interest Purchases – equity securities Payments to Acquire Equity Securities FV-NI Payments to Acquire Equity Securities FV-NI Investing activities Net Cash Provided by (Used in) Investing Activities, Continuing Operations [Abstract] Cost or Amortized Cost Debt Securities, Available-for-sale, Amortized Cost, Fiscal Year Maturity [Abstract] Dividends Dividends Residential mortgage-backed Residential Mortgage Backed Securities [Member] Subsegments [Domain] Subsegments [Domain] Total comprehensive loss Comprehensive Income (Loss), Net of Tax, Attributable to Parent Preferred stock, par value (in dollars per share) Preferred Stock, Par or Stated Value Per Share Other expenses Other Expenses Counterparty Name [Domain] Counterparty Name [Domain] Legal Entity [Axis] Legal Entity [Axis] Purchases of property and equipment Payments to Acquire Property, Plant, and Equipment City Area Code City Area Code Schedule of Gain (Loss) on Securities [Table] Schedule of Gain (Loss) on Securities [Table] Document Period End Date Document Period End Date Outstanding commitments to invest Commitment to Investment In Limited Partnership Commitment to Investment In Limited Partnership Goodwill and Intangible Assets Goodwill and Intangible Assets Disclosure [Text Block] Fixed maturity securities, gross unrealized losses Gross unrealized losses Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss Schedule of Dividends Dividends Declared [Table Text Block] Investment income (loss) Income (Loss) from Equity Method Investments Amortization of policy acquisition costs Deferred Policy Acquisition Costs, Amortization Expense Sales Proceeds From Bank Loan Participations Represents cash inflow from sales of bank loan participations. Contractual life (in years) Share Based Arrangement by Share Based Award Option Contractual Life Share Based Arrangement by Share Based Award Option Contractual Life Securities receivable or payable, net Payments for (Proceeds from) Unsettled Investments, Net Payments for (Proceeds from) Unsettled Investments, Net Sales Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales Senior debt issuances Proceeds from Issuance of Senior Long-term Debt Long-term Debt, Type [Domain] Long-term Debt, Type [Domain] Equity securities, at fair value (cost:  2021 – $81,855; 2020 – $81,698) Total equity securities Equity securities Equity Securities, FV-NI Entity [Domain] Entity [Domain] James River Group, Inc. James River Group Inc [Member] Represents information regarding James River Group, Inc. Number of bank loan participations held Number Of Bank Loan Participations Held Number Of Bank Loan Participations Held Cover [Abstract] Cover [Abstract] Schedule of Gross Unrealized Losses and Fair Value for Available-for-Sale Securities Debt Securities, Available-for-sale [Table Text Block] Cash distributions from LLCs Proceeds from Equity Method Investment, Distribution Net realized investment gains Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, before Tax Fair Value Disclosures [Abstract] Fair Value Disclosures [Abstract] Total invested assets Investments Fixed maturity securities Debt Securities [Member] Liability for Unpaid Claims and Claims Adjustment Expense, Period Increase (Decrease) [Abstract] Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward] Beginning balance Ending balance Asset value Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value Reclassification adjustment for investment gains realized in net income Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax Carrying values of limited partnerships held Carrying Values Of Limited Partnerships Held Represents carrying values of limited partnerships held across segments. Fixed maturity securities, available-for-sale, at fair value (amortized cost: 2021 – $1,755,733; 2020 – $1,690,890) Fixed maturity securities, available-for-sale Total investments available-for-sale, Fair Value Total fixed maturity securities, available-for-sale Debt Securities, Available-for-sale Cash provided by operating activities excluding reduction in collateral funds Net Cash Provided by (Used in) Operating Activities Excluding Change in Collateral Funds Net Cash Provided by (Used in) Operating Activities Excluding Change in Collateral Funds Equity Components [Axis] Equity Components [Axis] Limited partnerships Partnership Interest [Member] Minimum Minimum [Member] Maturities Proceeds From Maturities From Bank Loan Participations Represents cash inflow from maturities of bank loan participations. Net written premiums Premiums Written, Net Unpaid principal balance Fair Value, Option, Loans Held as Assets, Aggregate Unpaid Principal Balance Fair Value, Option, Loans Held as Assets, Aggregate Unpaid Principal Balance Letter of credit 100 Million 2017 Facility 2017 Facility [Member] 2017 Facility Funds held Funds Held under Reinsurance Agreements, Liability Forfeited (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value Entity Interactive Data Current Entity Interactive Data Current UNITED STATES UNITED STATES Exercised (in dollars per share) Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price Revenues Revenues [Abstract] Fair Value Measurements Fair Value Disclosures [Text Block] Capital Stock and Equity Awards Stockholders' Equity Note Disclosure [Text Block] Maturities, calls and paydowns Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements Schedule of Summary of Option Activity Share-based Payment Arrangement, Option, Activity [Table Text Block] Reserve For Losses And Loss Adjustment Expenses [Line Items] Reserve For Losses And Loss Adjustment Expenses [Line Items] Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. Current year Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid, Current Year Maturities and calls – fixed maturity securities Proceeds from Maturities, Prepayments and Calls of Debt Securities, Available-for-sale Contingent Liabilities [Table] Contingent Liabilities [Table] Discloses information about contingent liabilities. Cumulative Effect, Period of Adoption, Adjustment Cumulative Effect, Period of Adoption, Adjustment [Member] Entity Registrant Name Entity Registrant Name Subsequent Event Type [Domain] Subsequent Event Type [Domain] Business Acquisition [Line Items] Business Acquisition [Line Items] Below BBB- Standard & Poor's, Below BBB- Rating [Member] Standard & Poor's, Below BBB- Rating [Member] Statement of Stockholders' Equity [Abstract] Statement of Stockholders' Equity [Abstract] Deduct: Loss and loss adjustment expense payments net of reinsurance: Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid [Abstract] Other operating expenses Total Other Cost and Expense, Operating Schedule of Underwriting Profit of Operating Segments by Individual Segment and Reconciliation to Consolidated Income Before Taxes Reconciliation of Operating Profit (Loss) from Segments to Consolidated [Table Text Block] Weighted- Average Exercise Price Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract] Total Intangible Assets, Gross Intangible Assets, Gross (Excluding Goodwill) Underwriting (loss) profit of insurance segments Total underwriting (loss) profit of insurance segments Underwriting Profit Loss Of Operating Segments This element represents amount of underwriting Profit (loss) of operating segments. Number of reportable segments Number of Reportable Segments One year or less Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, Year One Net investment income Net investment income Net Investment Income Purchases Payments to Acquire Other Investments Equity securities Equity Securities [Member] Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Invested assets: Investments [Abstract] Dividend payable, record date Dividends Payable, Date of Record 2014 Director Plan Non Employee Director Incentive Plan 2014 [Member] Represents information regarding 2014 Non Employee Director Incentive Plan. Deferred policy acquisition costs Deferred Policy Acquisition Cost Accounting Standards Update [Axis] Accounting Standards Update [Axis] Reserve for Losses and Loss Adjustment Expenses Liability For Claims And Claims Adjustment Expense [Text Block] The entire disclosure for the liability for claims and claims adjustment expense. Total investments available-for-sale, Gross Unrealized Losses Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax Entity Address, Postal Zip Code Entity Address, Postal Zip Code Trademarks Trademarks [Member] Dividends payable, date to be paid Dividends Payable, Date to be Paid Other underwriting expenses of the operating segments Other Underwriting Expense Other Operating Expenses and Other Expenses Other Operating Income and Expense [Text Block] Schedule of Components of Comprehensive Income (Loss) Comprehensive Income (Loss) [Table Text Block] Fixed maturity securities Debt Securities, Available-for-sale, Realized Gain (Loss) Carrying value of collateralized loan obligation held Carrying Value Of Collateralized Loan Obligation Held Represents carrying value of carrying value of collateralized loan obligation held. Fair Value Measurement Inputs and Valuation Techniques [Table] Fair Value Measurement Inputs and Valuation Techniques [Table] Goodwill Segment goodwill Goodwill Debt Securities, Available-for-sale [Line Items] Debt Securities, Available-for-sale [Line Items] One year or less Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, Year One Net unrealized losses, net of taxes of $(5,647) in 2021 and $(1,391) in 2020 Other comprehensive loss Other comprehensive loss Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent Document Transition Report Document Transition Report Title of Individual [Axis] Title of Individual [Axis] Fixed maturity securities, 12 months or more, gross unrealized losses Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss Dividend declared per share (in dollars per share) Common Stock, Dividends, Per Share, Declared Equity securities Equity Securities, FV-NI, Realized Gain (Loss) Significant Other Observable Inputs Level 2 Fair Value, Inputs, Level 2 [Member] After five years through ten years Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10 Broker relationships Broker Relationships [Member] Represents information related to broker relationships. Prior years Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid, Prior Years Document Quarterly Report Document Quarterly Report Forfeited (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period Asset Class [Domain] Asset Class [Domain] Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table] Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table] Accounting Policies [Table] Accounting Policies [Table] Accounting Policies ASU 2016-13 Accounting Standards Update 2016-13 [Member] Subsequent Event [Line Items] Subsequent Event [Line Items] Accounting Standards Update [Extensible List] Accounting Standards Update [Extensible List] Granted (in dollars per share) Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price Cumulative Effect, Period of Adoption [Axis] Cumulative Effect, Period of Adoption [Axis] Reinsurance recoverable on unpaid losses, net Reinsurance Recoverable for Unpaid Claims and Claims Adjustments Credit Facility [Domain] Credit Facility [Domain] Diluted (in shares) Diluted (in shares) Weighted Average Number of Shares Outstanding, Diluted Basic loss per share (in dollars per share) Basic (in dollars per share) Earnings Per Share, Basic Tax on net unrealized gains (losses) OCI, Debt Securities, Available-for-Sale, Gain (Loss), after Adjustment, Tax Entity File Number Entity File Number Forfeited (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period Debt Disclosure [Abstract] Debt Disclosure [Abstract] Operating activities Net Cash Provided by (Used in) Operating Activities, Continuing Operations [Abstract] Unsecured Debt Unsecured Debt [Member] Net cash (used in) provided by financing activities Net Cash Provided by (Used in) Financing Activities ASU 2019-05 Accounting Standards Update 2019-05 [Member] Share based compensation expense Share-based Payment Arrangement, Expense Counterparty Name [Axis] Counterparty Name [Axis] Common Shares – 2021 and 2020: $0.0002 par value; 200,000,000 shares authorized; 30,774,930 and 30,649,261 shares issued and outstanding, respectively Common Stock, Value, Issued Goodwill and Intangible Assets Disclosure [Abstract] Goodwill and Intangible Assets Disclosure [Abstract] Document Fiscal Year Focus Document Fiscal Year Focus Ceded written premiums Ceded Premiums Written U.S. tax benefit on share based compensation expense Share-based Payment Arrangement, Expense, Tax Benefit Entity Current Reporting Status Entity Current Reporting Status External Credit Rating, Standard & Poor's [Domain] External Credit Rating, Standard & Poor's [Domain] Favorable development on prior year loss reserves Development On Prior Year Loss Reserves [Abstract] Subsequent Event [Table] Subsequent Event [Table] Purchases – fixed maturity securities Payments to Acquire Debt Securities, Available-for-sale Third-party Reinsureds Third-party Reinsureds [Member] Third-party Reinsureds [Member] Schedule of Long-term Debt Instruments [Table] Schedule of Long-term Debt Instruments [Table] Granted (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value Other income Other Income JRG Reinsurance Company, Ltd. Jrg Reinsurance Company Ltd [Member] Represents reinsurance subsidiary of the entity. Sales – equity securities Proceeds from Sale of Equity Securities FV-NI Proceeds from Sale of Equity Securities FV-NI Common stock, shares issued (in shares) Common Stock, Shares, Issued Cash and cash equivalents Cash and Cash Equivalents, at Carrying Value Residential mortgage-backed Residential Mortgage Backed Amortized Cost Represents Amortized Cost of Residential mortgage-backed securities. Segment Reporting [Abstract] Segment Reporting [Abstract] Accounting Policies Basis of Presentation and Significant Accounting Policies [Text Block] Debt Instrument [Line Items] Debt Instrument [Line Items] Total shareholders’ equity Balance Balance Shareholders' equity Stockholders' Equity Attributable to Parent Available-for-sale fixed maturity securities and equity securities Securities (Assets) [Member] Total liabilities and shareholders’ equity Liabilities and Equity Investments Investment [Text Block] Accumulated other comprehensive income Accumulated Other Comprehensive Income (Loss), Net of Tax Amortization of discount Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Amortization of Discount Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Amortization of Discount Entity Address, City or Town Entity Address, City or Town Portion at Fair Value Measurement Portion at Fair Value Measurement [Member] Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] RSUs RSUs Restricted Stock Units (RSUs) [Member] Financial Instrument [Axis] Financial Instrument [Axis] Accounting Standards Update [Domain] Accounting Standards Update [Domain] Number of securities excluded from the calculations of diluted earnings per share Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Indefinite-lived Intangible Assets [Axis] Indefinite-lived Intangible Assets [Axis] Life (Years) Finite-Lived Intangible Asset, Useful Life Change in restricted cash equivalents Increase (Decrease) in Restricted Cash and Investments Equity Component [Domain] Equity Component [Domain] Bank Loan Participations Loan Participations and Assignments [Member] Dividends paid Payments of Dividends Commercial mortgage and asset-backed Commercial Mortgage And Asset Backed Amortized Cost Represents amortized cost of commercial mortgage and asset-backed. Liabilities: Liabilities [Abstract] Equity securities, gross realized gain Equity Securities, FV-NI, Realized Gain Entity Tax Identification Number Entity Tax Identification Number Bank loan participations, gross realized losses Bank Loan Participations, Gross Realized Loss Represents the gross realized losses on bank loan participations. Net loss Net loss Net loss to shareholders Net Income (Loss) Attributable to Parent Investment, Name [Domain] Investment, Name [Domain] U.S. income taxes Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Tax Changes in fair values of short-term investments and other Short Term Investments And Other, Changes in Fair Value Short Term Investments And Other, Changes in Fair Value After ten years Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year 10 After one year through five years Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year One Through Five Long-term Debt, Type [Axis] Long-term Debt, Type [Axis] Changes in fair values of bank loan participations Bank Loan Participations, Changes in Fair Value Bank Loan Participations, Changes in Fair Value Excess and Surplus Lines Excess And Surplus Lines [Member] Represents information regarding excess and surplus lines segment. Current Fiscal Year End Date Current Fiscal Year End Date Corporate and Other Corporate and Other [Member] Expenses Operating Expenses [Abstract] Earnings Per Share [Abstract] Earnings Per Share [Abstract] Losses due to credit-related impairments Bank Loan Participations, Increase (Decrease) in Fair Value, Credit-Related Impairment Bank Loan Participations, Increase (Decrease) in Fair Value, Credit-Related Impairment Net Investment Income [Line Items] Net Investment Income [Line Items] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Percentage of available for sale securities Percentage Of Available For Sale Debt Securities Represents percentage of available for sale debt securities. Shareholders’ equity: Stockholders' Equity Attributable to Parent [Abstract] Shares Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] Document Fiscal Period Focus Document Fiscal Period Focus Liabilities Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract] Supplemental information Supplemental Cash Flow Information [Abstract] Business Acquisition, Acquiree [Domain] Business Acquisition, Acquiree [Domain] Entity Filer Category Entity Filer Category Schedule of Summary of Share Based Compensation Expense and Related Tax Benefit Share-based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block] Common Shares Common stock Common Stock [Member] Commercial mortgage and asset-backed Commercial Mortgage And Asset Backed Fair Value Represents fair value of commercial mortgage and asset backed. Stock options and restricted share units ("RSU's") Stock Options And Restricted Stock Units Rsu [Member] Stock options and share instrument which is convertible to stock or an equivalent amount of cash, after a specified period of time or when specified performance conditions are met. Number of common shares issued during period (in shares) Stock Issued During Period, Shares, New Issues Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table] Accounting Policies [Line Items] Accounting Policies [Line Items] Accounting Policies Gross Carrying Amount Finite-Lived Intangible Assets, Gross Gross written premiums Premiums Written, Gross Bank Holding Company Investment In Bank Holding Company [Member] Represents information about Investment in bank holding company. Identifiable intangible assets subject to amortization Finite-Lived Intangible Assets, Net [Abstract] Fixed maturity securities, less than 12 months, gross unrealized losses Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss Renewable energy LLCs Renewable Energy Llcs [Member] Name of the investment category. Liability for Claims and Claims Adjustment Expense [Abstract] Liability for Claims and Claims Adjustment Expense [Abstract] Exercise of stock options (in shares) Exercised (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period Change in cash, cash equivalents, and restricted cash equivalents Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect Unrealized losses arising during the period, before U.S. income taxes OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment and Tax Total gains or losses (realized/unrealized)-Included in other comprehensive income Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) Bank loan participations, gross realized gains Bank Loan Participations, Gross Realized Gain Represents the gross realized gains on bank loan participations. Non-qualified stock options Options Share-based Payment Arrangement, Option [Member] Basis of Presentation Basis of Accounting, Policy [Policy Text Block] Basic (in shares) Weighted Average Number of Shares Outstanding, Basic Securities available-for-sale: Fixed maturity securities, available-for-sale: Debt Securities, Available-for-sale [Abstract] Subsequent Events [Abstract] Subsequent Events [Abstract] Forfeited (in dollars per share) Share-based Compensation Arrangements by Share-based Payment Award, Options, Forfeitures in Period, Weighted Average Exercise Price Number of issuers Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions Variable Interest Entities Consolidation, Variable Interest Entity, Policy [Policy Text Block] Carrying Value Reported Value Measurement [Member] Plan Name [Domain] Plan Name [Domain] Dividends payable Dividends Payable Ownership percentage Equity Method Investment, Ownership Percentage Interest paid Interest Paid, Excluding Capitalized Interest, Operating Activities Schedule of Other Operating Expenses Schedule of Other Operating Cost and Expense, by Component [Table Text Block] Additional paid-in capital Additional Paid in Capital Total revenues Total revenues Revenues Transfers out of Level 3 Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3 Current year Current Year Claims and Claims Adjustment Expense Income tax benefit Income tax benefit Income Tax Expense (Benefit) Investment Income [Table] Investment Income [Table] Schedule of Summary of RSU Activity Schedule of Nonvested Restricted Stock Units Activity [Table Text Block] Cash, cash equivalents, and restricted cash equivalents at beginning of period Cash, cash equivalents, and restricted cash equivalents at end of period Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents Debt Securities, Available-for-sale [Table] Debt Securities, Available-for-sale [Table] Renewable energy notes receivable Renewable Energy Bridge Financing Notes [Member] Name of the investment category. Title of Individual [Domain] Title of Individual [Domain] Indefinite-lived Intangible Assets, Major Class Name [Domain] Indefinite-lived Intangible Assets, Major Class Name [Domain] Diluted loss per share (in dollars per share) Diluted (in dollars per share) Earnings Per Share, Diluted Other operating expenses of the Corporate and Other segment Other operating expenses of the Corporate and Other segment Other Operating Expenses Of Corporate And Other Segment Represents Other operating expenses of the Corporate and Other segment. Sales – fixed maturity securities Proceeds from Sale of Debt Securities, Available-for-sale Local Phone Number Local Phone Number Return of capital Proceeds From Other Invested Asset Return Of Capital Represents cash inflow from other invested asset return of capital. Cumulative Effect, Period of Adoption [Domain] Cumulative Effect, Period of Adoption [Domain] Entity Address, Address Line Three Entity Address, Address Line Three Schedule of Gross Carrying Amounts and Accumulated Amortization Schedule of Indefinite-Lived Intangible Assets [Table Text Block] Investment income Investment Income, Net Entity Address, Address Line One Entity Address, Address Line One Entity Address, Address Line Two Entity Address, Address Line Two Entity Emerging Growth Company Entity Emerging Growth Company 2014 LTIP Long Term Incentive Plan 2014 [Member] Represents information regarding Long Term Incentive Plan 2014. Exercise of stock options Stock Issued During Period, Value, Stock Options Exercised Number of equity securities held Number Of Equity Securities Held Number Of Equity Securities Held Identifiable intangibles not subject to amortization Indefinite-lived Intangible Assets (Excluding Goodwill) Investment in LLC Investment In Llc [Member] Represents investment in LLC`s. Accrued investment income Accrued Investment Income Receivable Line of credit (up to) Line of Credit Facility, Maximum Borrowing Capacity Award Type [Axis] Award Type [Axis] Weighted- Average Grant Date Fair Value Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract] Change in net unearned premiums (Increase) Decrease in Unearned Premiums, Net Accumulated Amortization Finite-Lived Intangible Assets, Accumulated Amortization Maximum Maximum [Member] Preferred stock, shares authorized (in shares) Preferred Stock, Shares Authorized Net realized and unrealized gains (losses) on investments Total Gain (Loss) on Investments Total Amount (thousands) Dividends, Common Stock, Cash Retained Earnings (Deficit) Retained Earnings Retained Earnings [Member] Preferred stock, shares outstanding (in shares) Preferred Stock, Shares Outstanding Measurement Basis [Axis] Measurement Basis [Axis] Add: Incurred losses and loss adjustment expenses net of reinsurance: Liability for Unpaid Claims and Claims Adjustment Expense, Incurred Claims [Abstract] Effective U.S. federal income tax benefit rate Effective Income Tax Rate Reconciliation, Percent Net cash provided by (used in) investing activities Net Cash Provided by (Used in) Investing Activities Collateral trust arrangement amount Assets Held-in-trust Letter of credit 75 Million Letter Of Credit 75 Million [Member] Letter Of Credit 75 Million [Member] Weighted-average remaining contractual life of options outstanding Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Award Type [Domain] Award Type [Domain] Investments [Domain] Investments [Domain] Corporate Corporate Debt Securities [Member] Trading Symbol Trading Symbol Gain (Loss) on Securities [Line Items] Gain (Loss) on Securities [Line Items] Exercisable, end of period (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price Weighted average common shares outstanding: Weighted Average Number of Shares Outstanding Reconciliation [Abstract] Issuance of common shares under equity incentive plans Proceeds, Issuance of Shares, Share-based Payment Arrangement, Including Option Exercised Fair Value, by Balance Sheet Grouping [Table] Fair Value, by Balance Sheet Grouping [Table] Earnings Per Share Earnings Per Share [Text Block] Schedule of Reconciliation of Beginning and Ending Reserve Balances for Losses and Loss Adjustment Expenses Schedule of Liability for Unpaid Claims and Claims Adjustment Expense [Table Text Block] Investment in private subordinated notes Other invested assets – notes receivable Notes Receivable Represents carrying value of notes receivable as on reporting date. Financing activities Net Cash Provided by (Used in) Financing Activities, Continuing Operations [Abstract] Entity Shell Company Entity Shell Company Segment Reporting Information [Line Items] Segment Reporting Information [Line Items] Fair Value Measurement Inputs and Valuation Techniques [Line Items] Fair Value Measurement Inputs and Valuation Techniques [Line Items] Recurring basis Fair Value, Recurring Fair Value, Recurring [Member] Prepaid reinsurance premiums Prepaid Reinsurance Premiums Net earned premiums Net earned premiums Premiums Earned, Net Transfers in to Level 3 Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3 Amount drawn Proceeds from Lines of Credit Statement of Financial Position [Abstract] Statement of Financial Position [Abstract] Short-term investments Short-term Investments Subsegments [Axis] Subsegments [Axis]