0000001 - Document - Cover Page link:presentationLink link:calculationLink link:definitionLink 9952151 - Statement - Consolidated Balance Sheets link:presentationLink link:calculationLink link:definitionLink 9952152 - Statement - Consolidated Balance Sheets (Parenthetical) link:presentationLink link:calculationLink link:definitionLink 9952153 - Statement - Unaudited Consolidated Statements of Income link:presentationLink link:calculationLink link:definitionLink 9952154 - Statement - Unaudited Consolidated Statements of Comprehensive Income (Loss) link:presentationLink link:calculationLink link:definitionLink 9952155 - Statement - Unaudited Consolidated Statements of Stockholders' Equity link:presentationLink link:calculationLink link:definitionLink 9952156 - Statement - Unaudited Consolidated Statements of Cash Flows link:presentationLink link:calculationLink link:definitionLink 9952157 - Statement - Unaudited Consolidated Statements of Cash Flows (Parenthetical) link:presentationLink link:calculationLink link:definitionLink 9952158 - Disclosure - Basis of Presentation link:presentationLink link:calculationLink link:definitionLink 9952159 - Disclosure - Adoption of Accounting Pronouncements link:presentationLink link:calculationLink link:definitionLink 9952160 - Disclosure - Statements of Cash Flows link:presentationLink link:calculationLink link:definitionLink 9952161 - Disclosure - Investments link:presentationLink link:calculationLink link:definitionLink 9952162 - Disclosure - Fair Value Measurements link:presentationLink link:calculationLink link:definitionLink 9952163 - Disclosure - Allowance for Credit Losses on Premiums Receivable link:presentationLink link:calculationLink link:definitionLink 9952164 - Disclosure - Reinsurance link:presentationLink link:calculationLink link:definitionLink 9952165 - Disclosure - Reserve for Loss and Loss Expense link:presentationLink link:calculationLink link:definitionLink 9952166 - Disclosure - Segment Information link:presentationLink link:calculationLink link:definitionLink 9952167 - Disclosure - Retirement Plans link:presentationLink link:calculationLink link:definitionLink 9952168 - Disclosure - Comprehensive Income (Loss) link:presentationLink link:calculationLink link:definitionLink 9952169 - Disclosure - Equity link:presentationLink link:calculationLink link:definitionLink 9952170 - Disclosure - Earnings per Common Share link:presentationLink link:calculationLink link:definitionLink 9952171 - Disclosure - Related Party Transactions link:presentationLink link:calculationLink link:definitionLink 9952172 - Disclosure - Litigation link:presentationLink link:calculationLink link:definitionLink 9955511 - Disclosure - Basis of Presentation (Policies) link:presentationLink link:calculationLink link:definitionLink 9955512 - Disclosure - Statements of Cash Flows (Tables) link:presentationLink link:calculationLink link:definitionLink 9955513 - Disclosure - Investments (Tables) link:presentationLink link:calculationLink link:definitionLink 9955514 - Disclosure - Fair Value Measurements (Tables) link:presentationLink link:calculationLink link:definitionLink 9955515 - Disclosure - Allowance for Credit Losses on Premiums Receivable (Tables) link:presentationLink link:calculationLink link:definitionLink 9955516 - Disclosure - Reinsurance (Tables) link:presentationLink link:calculationLink link:definitionLink 9955517 - Disclosure - Reserve for Loss and Loss Expense (Tables) link:presentationLink link:calculationLink link:definitionLink 9955518 - Disclosure - Segment Information (Tables) link:presentationLink link:calculationLink link:definitionLink 9955519 - Disclosure - Retirement Plans (Tables) link:presentationLink link:calculationLink link:definitionLink 9955520 - Disclosure - Comprehensive Income (Loss) (Tables) link:presentationLink link:calculationLink link:definitionLink 9955521 - Disclosure - Equity (Tables) link:presentationLink link:calculationLink link:definitionLink 9955522 - Disclosure - Earnings per Common Share (Tables) link:presentationLink link:calculationLink link:definitionLink 9955523 - Disclosure - Statements of Cash Flows - Schedule of Cash Flow Supplemental Disclosures (Details) link:presentationLink link:calculationLink link:definitionLink 9955524 - Disclosure - Statements of Cash Flows - Schedule of Cash and Restricted Cash (Details) link:presentationLink link:calculationLink link:definitionLink 9955525 - Disclosure - Investments - Schedule of Available-For-Sale Securities Disclosure (Details) link:presentationLink link:calculationLink link:definitionLink 9955526 - Disclosure - Investments - Schedule of Available-for-Sale Allowance for Credit Losses Roll Forward (Details) link:presentationLink link:calculationLink link:definitionLink 9955527 - Disclosure - Investments - Accrued Investment Income, Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 9955528 - Disclosure - Investments - Schedule of Fair Value and Gross Pre-Tax Net Unrealized Loss of Securities by Length of Time (Details) link:presentationLink link:calculationLink link:definitionLink 9955529 - Disclosure - Investments - Schedule of Fixed Income Securities by Contractual Maturity (Details) link:presentationLink link:calculationLink link:definitionLink 9955530 - Disclosure - Investments - Schedule of Alternative Investment Portfolio by Strategy and the Remaining Commitment Amount and Maximum Exposure to Loss Associated With Each Strategy (Details) link:presentationLink link:calculationLink link:definitionLink 9955531 - Disclosure - Investments - Schedule of Investments Pledged as Collateral (Details) link:presentationLink link:calculationLink link:definitionLink 9955532 - Disclosure - Investments - Credit Concentration Risk (Details) link:presentationLink link:calculationLink link:definitionLink 9955533 - Disclosure - Investments - Schedule of Pre-Tax Net Investment Income (Details) link:presentationLink link:calculationLink link:definitionLink 9955534 - Disclosure - Investments - Schedule of Net Realized and Unrealized Investment Gains and (Losses) (Details) link:presentationLink link:calculationLink link:definitionLink 9955535 - Disclosure - Investments - Schedule of Realized and Unrealized Gains (Losses) on Equity Securities (Details) link:presentationLink link:calculationLink link:definitionLink 9955536 - Disclosure - Fair Value Measurements - Schedule of Carrying Values and Estimated Fair Values of Financial Liabilities (Details) link:presentationLink link:calculationLink link:definitionLink 9955537 - Disclosure - Fair Value Measurements - Schedule of Quantitative Disclosures of Fair Value Assets (Details) link:presentationLink link:calculationLink link:definitionLink 9955538 - Disclosure - Fair Value Measurements - Schedule of Changes in Fair Value of Securities Using Level 3 Inputs (Details) link:presentationLink link:calculationLink link:definitionLink 9955538 - Disclosure - Fair Value Measurements - Schedule of Changes in Fair Value of Securities Using Level 3 Inputs (Details) link:presentationLink link:calculationLink link:definitionLink 9955539 - Disclosure - Fair Value Measurements - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 9955540 - Disclosure - Fair Value Measurements - Schedule of Quantitative Information about Significant Unobservable Inputs in the Fair Value Measurement of Level 3 Assets (Details) link:presentationLink link:calculationLink link:definitionLink 9955541 - Disclosure - Fair Value Measurements - Schedule of Quantitative Information of Our Financial Assets and Liabilities That Were Disclosed at Fair Value (Details) link:presentationLink link:calculationLink link:definitionLink 9955542 - Disclosure - Allowance for Credit Losses on Premiums Receivable (Details) link:presentationLink link:calculationLink link:definitionLink 9955543 - Disclosure - Reinsurance - Schedule of Disaggregation of Reinsurance Recoverable by Financial Strength Rating and Aging Analysis (Details) link:presentationLink link:calculationLink link:definitionLink 9955544 - Disclosure - Reinsurance - Schedule of Allowance for Credit Losses on Reinsurance Recoverable (Details) link:presentationLink link:calculationLink link:definitionLink 9955545 - Disclosure - Reinsurance - Schedule of Direct, Assumed, and Ceded Reinsurance Amounts (Details) link:presentationLink link:calculationLink link:definitionLink 9955546 - Disclosure - Reserve for Loss and Loss Expense - Schedule of Rollforward of Reserve for Loss and Loss Expense (Details) link:presentationLink link:calculationLink link:definitionLink 9955547 - Disclosure - Reserve for Loss and Loss Expense - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 9955548 - Disclosure - Segment Information - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 9955549 - Disclosure - Segment Information - Schedule of Revenue by Segment (Details) link:presentationLink link:calculationLink link:definitionLink 9955550 - Disclosure - Segment Information - Schedule of Segments Pre and After Tax Income, Significant Expenses and Reconciliations (Details) link:presentationLink link:calculationLink link:definitionLink 9955551 - Disclosure - Segment Information - Schedule of Return on Equity (Details) link:presentationLink link:calculationLink link:definitionLink 9955552 - Disclosure - Segment Information - Schedule of Combined Ratio (Details) link:presentationLink link:calculationLink link:definitionLink 9955553 - Disclosure - Retirement Plans - Schedule of Components of Net Periodic Benefit Cost (Details) link:presentationLink link:calculationLink link:definitionLink 9955554 - Disclosure - Retirement Plans - Schedule of Weighted-Average Expense Assumptions (Details) link:presentationLink link:calculationLink link:definitionLink 9955555 - Disclosure - Comprehensive Income (Loss) - Schedule of Components of Comprehensive Income-Gross and Net of Tax (Details) link:presentationLink link:calculationLink link:definitionLink 9955556 - Disclosure - Comprehensive Income (Loss) - Schedule of Components of Accumulated Other Comprehensive Income (Loss) (Details) link:presentationLink link:calculationLink link:definitionLink 9955557 - Disclosure - Comprehensive Income (Loss) - Schedule of Reclassification out of AOCI (Details) link:presentationLink link:calculationLink link:definitionLink 9955558 - Disclosure - Equity - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 9955559 - Disclosure - Equity - Schedule of Share Repurchase Program (Details) link:presentationLink link:calculationLink link:definitionLink 9955560 - Disclosure - Earnings per Common Share (Details) link:presentationLink link:calculationLink link:definitionLink 9955561 - Disclosure - Related Party Transactions (Details) link:presentationLink link:calculationLink link:definitionLink 9955562 - Disclosure - Litigation (Details) link:presentationLink link:calculationLink link:definitionLink