Document and Entity Information Document And Entity Information [Abstract] Statement [Table] Statement [Line Items] Document Type Amendment Flag Document Period End Date Document Fiscal Year Focus Document Fiscal Period Focus Entity Registrant Name Entity Central Index Key Current Fiscal Year End Date Entity Filer Category Entity Common Stock, Shares Outstanding Entity Well-known Seasoned Issuer Entity Voluntary Filers Entity Current Reporting Status Entity Public Float Consolidated Balance Sheets [Abstract] Assets Abstract ASSETS Fixed maturities trading (amortized cost $2,654,342; $2,673,079) Fixed maturities trading (amortized cost $2,345,620; $2,617,656) Equity securities trading (cost $322,103; $308,941) Equity securities trading (cost $388,417; $336,757) Trading Securities, Unclassified, Equity, Total Short-term investments (cost $162,278; $156,126) Short-term investments (cost $236,433; $143,378) Short-term Investments, Total Short-term investments Investments, Total Investments Total investments Cash End of year Beginning of year Cash Cash Receivables: Premiums Premiums Receivable, at Carrying Value, Total Accrued investment income Accrued Investment Income Receivable, Total Other Receivables Other Total receivables Total receivables Deferred Policy Acquisition Costs, Assets Deferred policy acquisition costs Deferred Policy Acquisition Costs, Total Deferred policy acquisition costs Fixed assets, net Property, Plant and Equipment, Net, Ending Balance Property, Plant and Equipment, Net, Beginning Balance Fixed assets, net Current income taxes Deferred income taxes Deferred Tax Assets, Net, Total Goodwill Goodwill, Ending Balance Goodwill, Beginning Balance Goodwill, Total Other intangible assets, net Other intangible assets, net Other assets Other Assets, Total Assets Total assets Liabilities And Stockholders Equity Abstract LIABILITIES AND SHAREHOLDERS' EQUITY Liability For Claims And Claims Adjustment Expense Property Casualty Liability Losses and loss adjustment expenses Unearned premiums Unearned Premiums, Total Notes Payable, Assets Notes payable Notes payable Note payable at maturity date Accounts payable and accrued expenses Accounts payable and accrued expenses Accrued Income Taxes, Current Current income taxes Other liabilities Other Liabilities, Total Total Liabilities Total liabilities Commitments And Contingencies 2009 Commitments and contingencies Shareholders' equity: Common stock without par value or stated value:Authorized 70,000,000 shares; issued and outstanding 0; 54,776,958 Common Stock, Value, Issued, Ending Balance Common Stock, Value, Issued, Beginning Balance Common stock Common Stock, Value, Issued, Total Common stock without par value or stated value: Authorized 70,000 shares; issued and outstanding 54,856; 54,803 Additional paid -in capital Additional Paid in Capital, Common Stock, Ending Balance Additional Paid in Capital, Common Stock, Beginning Balance Additional paid-in capital Accumulated other comprehensive loss Accumulated Other Comprehensive Income (Loss), Net of Tax, Ending Balance Accumulated Other Comprehensive Income (Loss), Net of Tax, Beginning Balance Accumulated other comprehensive loss Retained Earnings Accumulated Deficit Retained Earnings (Accumulated Deficit), Ending Balance Retained Earnings (Accumulated Deficit), Beginning Balance Retained earnings Retained earnings Total shareholders' equity End of year Beginning of year Total shareholders' equity Total liabilities and shareholders' equity Total liabilities and shareholders' equity Amortized cost on fixed maturity trading investments Amortized Cost On Fixed Maturity Trading Investments Amortized cost on fixed maturities trading investments Cost - Equity Security Trading Investments Cost Equity Security Trading Investments Cost - equity security trading investments Equity securities amortized cost Cost - Short-term investments Cost Short Term Investments Cost - short-term investments Common Stock Number Of Shares Par Value And Other Disclosures Abstract Common Stock Common Stock, No Par Value Common stock, par value Common stock, shares Authorized Common stock, shares issued Common Stock, Shares Issued, Total Common stock, shares outstanding Common Stock, Shares, Outstanding, Ending Balance Common Stock, Shares, Outstanding, Beginning Balance Consolidated Statements Of Operations [Abstract] Revenues: Net premiums earned Premiums Earned, Net, Property and Casualty, Total Interest And Dividend Income Operating Interest and Dividend Income, Operating, Total Net investment income Net realized investment gains (losses) Net realized investment gains Net realized investment (losses) gains Net realized investment gains (losses) Net realized investment gains Other Income Other Other Income, Total Revenues Total revenues Expenses: Policyholder Benefits And Claims Incurred Net Losses and loss adjustment expenses Losses and loss adjustment expenses Policy acquisition costs Deferred Policy Acquisition Cost, Amortization Expense, Total Other operating expenses Other Cost and Expense, Operating, Total Interest Interest Total expenses Total expenses Income (loss) before income taxes, minority interest, and income (loss) from equity method investments (Loss) income before income taxes and equity in net income of subsidiaries Income before income taxes Income (loss) before income taxes Income tax expense Income tax expense (benefit) Income tax expense Total Income tax (benefit) expense Net income Net income Net income Net income Net income per share: Basic Basic earnings per share Basic Per-Share Amount, Basic Diluted Diluted earnings per share Diluted Per-Share Amount, Diluted Consolidated Statements Of Comprehensive Income [Abstract] Other comprehensive gain (loss) before tax: (Losses) gains on hedging instrument Gains (losses) on hedging instrument Losses on hedging instrument Other comprehensive (loss) income , before tax Other comprehensive gain (loss) before tax Income tax benefit related to losses on hedging instrument Income tax expense (benefit) related to gains (losses) on hedging instrument Income tax benefit related to losses on hedging instrument Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent Comprehensive income, net of tax Comprehensive income (loss), net of tax Consolidated Statements of Stockholders' Equity [Abstract] Statement, Equity Components [Axis] Equity Component [Domain] Equity Component [Domain] Common Stock [Member] Common Stock [Member] Additional Paid In Capital [Member] Additional Paid In Capital [Member] Accumulated Other Comprehensive Income [Member] Accumulated Other Comprehensive Loss [Member] Retained Earnings [Member] Retained Earnings [Member] Proceeds from stock options exercised Proceeds of stock options exercised Share Based Compensation Share-based compensation expense Share-based compensation Share-based compensation Excess tax benefit from exercise of stock options Excess tax benefit from exercise of stock options Tax benefit on sales of incentive stock options Stock Issued During Period, Value, Stock Options Exercised Exercise of stock options Exercise of stock options Other Comprehensive Income (Loss), Net of Tax Change in other comprehensive loss, net of tax Other Comprehensive Income (Loss), Net of Tax, Total Dividends paid to shareholders Dividends paid to shareholders Consolidated Statements Of Cash Flows [Abstract] CASH FLOWS FROM OPERATING ACTIVITIES Cash flows from operating activities: Adjustments to reconcile net income to net cash provided by operating activities: Depreciation and amortization Depreciation and amortization Bond (accretion) amortization, net Bond amortization, net (Increase) decrease in premiums receivable (Increase) decrease in premiums receivable (Decrease) Increase in current and deferred income taxes Decrease in current and deferred income taxes (Increase) decrease in current and deferred income taxes Decrease in current and deferred income taxes (Increase) Decrease in deferred policy acquisition costs (Increase) decrease in deferred policy acquisition costs Decrease in unpaid losses and loss adjustment expenses Decrease in unpaid losses and loss adjustment expenses Increase (decrease) in unearned premiums Increase (decrease) in unearned premiums Increase (decrease) in accounts payable and accrued expenses (Decrease) increase in accounts payable and accrued expenses Increase (decrease) in accounts payable and accrued expenses Increase in accounts payable and accrued expenses Decrease (increase) in trading securities in nature, net of realized gains and losses Decrease in trading securities in nature, net of realized gains and losses Decrease (increase) in trading securities in nature, net of realized gains and losses Decrease in trading securities in nature, net of realized gains and losses Decrease in other payables Decrease in other payables Decrease in other payables Increase Decrease In Other Operating Liabilities Other, net Increase (Decrease) in Other Operating Liabilities, Total Net Cash Provided by (Used in) Operating Activities Net cash provided by (used in) operating activities Net cash provided by operating activities Net cash (used in) provided by operating activities CASH FLOWS FROM INVESTING ACTIVITIES Cash flows from investing activities: Payments To Acquire Available For Sale Securities Debt Fixed maturities available for sale in nature: Purchases Purchases Fixed maturities available-for-sale in nature: Purchases Proceeds From Sale Of Available For Sale Securities Debt Sales Calls or maturities Calls Payments to Acquire Marketable Securities [Abstract] Equity securities available for sale in nature: Purchases Purchases Sales Proceeds From Calls Of Available For Sale Securities Proceeds From Calls Of Available For Sale Securities Calls Net increase (decrease) in payable for securities Net (decrease) increase in payable for securities Net decrease in payable for securities Proceeds From Sale Of Short Term Investments Net decrease in short-term investments Net increase in short-term investments Net (increase) decrease in short-term investments Purchase of fixed assets Purchase of fixed assets Purchase of fixed assets Sale and write-off of fixed assets Sale of fixed assets Sale of fixed assets Business acquisition, net of cash acquired Business acquisition, net of cash acquired Business acquisition, net of cash acquired Other, net Other, net Net Cash Provided by (Used in) Investing Activities Net cash provided by (used in) investing activities CASH FLOWS FROM FINANCING ACTIVITIES Cash flows from financing activities: Excess Tax Benefit From Share Based Compensation Financing Activities Excess tax benefit from exercise of stock options Repayments of Unsecured Debt Payment to retire senior notes Senior notes retired Repayments of Long-term Lines of Credit Payoff bank loan Proceeds from bank loan Proceeds from bank loan Net Cash Provided by (Used in) Financing Activities Net cash used in financing activities Cash and Cash Equivalents, Period Increase (Decrease) Net (decrease) increase in cash Net increase (decrease) in cash Cash: SUPPLEMENTAL CASH FLOW DISCLOSURE Interest paid Interest Paid, Total Income taxes paid Income taxes paid Summary Of Significant Accounting Policies [Abstract] Significant Accounting Policies [Text Block] Summary Of Significant Accounting Policies Investments [Abstract] Investments, at fair value: Investment [Text Block] Investments Fair Value Measurements [Abstract] Fair Value Measurement Inputs Disclosure Text Block Fair Value Measurements Fixed Assets [Abstract] Property, Plant and Equipment Disclosure [Text Block] Fixed Assets Deferred Policy Acquisition Costs [Abstract] Deferred Policy Acquisition Costs [Text Block] Deferred Policy Acquisition Costs Notes Payable [Abstract] Debt Disclosure [Text Block] Notes Payable Derivative Financial Instruments [Abstract] Derivative Instruments And Hedging Activities Disclosure Text Block Derivative Financial Instruments Acquisition [Abstract] Business Combination Disclosure [Text Block] Acquisition Goodwill And Other Intangible Assets [Abstract] Goodwill And Intangible Assets Disclosure Text Block Goodwill And Other Intangible Assets Income Taxes [Abstract] Income Tax Disclosure Text Block Income Taxes Losses And Loss Adjustment Expenses [Abstract] Liability for Future Policy Benefits and Unpaid Claims Disclosure [Text Block] Losses And Loss Adjustment Expenses Dividends [Abstract] This includes a summary of shareholder dividends paid in total and per share. Further, this includes disclosures relating to statutory restrictions on the payment of dividends as prescribed by state regulatory authorities. Dividends And Statutory Restrictions [Table Text Block] Dividends Statutory Balances And Accounting Practices [Abstract] Statutory Balances And Accounting Practices [Abstract] Statutory Accounting Practices Disclosure [Table Text Block] Statutory Balances And Accounting Practices Profit Sharing Plan [Abstract] Schedule of Employee Stock Ownership Plan (ESOP) Disclosures [Table Text Block] Profit Sharing Plan Share-Based Compensation [Abstract] Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest Share-Based Compensation Earnings Per Share [Abstract] Earnings Per Share [Text Block] Earnings Per Share Commitments And Contingencies [Abstract] Commitments And Contingencies Disclosure Text Block Contingencies Commitments And Contingencies Risks And Uncertainties [Abstract] Risks And Uncertainties [Text Block] Risks And Uncertainties [Text Block] Risks And Uncertainties Quarterly Financial Information [Abstract] Quarterly Financial Information [Text Block] Quarterly Financial Information Summary of Investments Other Than Investments In Related Parties [Abstract] Summary of Investments, Other than Investments in Related Parties [Text Block] Summary Of Investments Other Than Investments In Related Parties Condensed Financial Information Of Registrant [Abstract] Condensed Financial Information of Parent Company Only Disclosure [Text Block] Condensed Financial Information Of Registrant Property And Liability Insurance Earned Premiums [Abstract] Schedule of Supplemental Information for Property, Casualty Insurance Underwriters [Text Block] Property And Liability Insurance Earned Premiums Consolidation and Basis of Presentation [Policy Text Block] Consolidation And Basis Of Presentation Consolidation And Basis Of Presentation Use of Estimates, Policy [Policy Text Block] Use Of Estimates Investment, Policy [Policy Text Block] Investments Fair Value of Financial Instruments, Policy [Policy Text Block] Fair Value Of Financial Instruments Disclosure of the carrying value of investment securities on deposit with regulatory authorities as being restricted balances. Securities On Deposits [Policy Text Block] Securities On Deposit Deferred Charges, Policy [Policy Text Block] Deferred Policy Acquisition Costs Fixed Assets [Policy Text Block] Fixed Assets Goodwill and Intangible Assets, Policy [Policy Text Block] Goodwill And Other Intangible Assets Revenue Recognition, Premiums Earned, Policy [Policy Text Block] Premium Revenue Recognition Disclosure of accounting policies for losses and loss adjustment expenses. Losses And Loss Adjustment Expenses [Policy Text Block] Losses And Loss Adjustment Expenses