TOTAL INVESTED ASSETS Cash TOTAL ASSETS Other Assets Goodwill Premiums Receivable Reinsurance Recoverable on Unpaid Losses and Loss Expenses Prepaid Reinsurance Premiums Deferred Policy Acquisition Costs Accrued Investment Income Deferred Income Tax Unearned Premiums TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY TOTAL SHAREHOLDERS' EQUITY TOTAL LIABILITIES Long Term Debt Accrued Expenses and Other Liabilities Common Stock - $1 Par Value; 371,980,710 and 374,649,923 Shares Common Stock, Par Value Common Stock, Par Value Treasury Stock, Shares Treasury Stock, Shares, Ending Balance Treasury Stock, Shares, Beginning Balance Treasury Stock, Shares Treasury Stock, at Cost - 16,279,184 Shares in 2008 Treasury Stock, at Cost - 45,208,422 and 39,972,796 Shares Treasury Stock, at Cost - XX,XXX,XXX and 39,972,796 Shares Treasury Stock, at Cost - XX,XXX,XXX and 39,972,796 Shares Treasury Stock, at Cost - XX,XXX,XXX and 39,972,796 Shares Treasury Stock, at Cost - XX,XXX,XXX and 39,972,796 Shares Accumulated Other Comprehensive Income Retained Earnings Common Stock, Shares, Outstanding Common Stock, Shares, Outstanding, Total Common Stock, Shares Issued Investment Income Other Revenues Total Revenues Gain (Loss) on Investments Realized Investment Losses (Gains), Net Total Realized Gains (Losses), Net Total Realized Investment Gains (Losses), Net Total Realized Gains (Losses), Net Dividends Declared Per Share Amortization of Deferred Policy Acquisition Costs Income Before Federal and Foreign Income Tax Net Income Basic Diluted Investment Expenses Comprehensive Income Net Income Net Cash Provided by Operating Activities Increase decrease in other operating capital net Depreciation Amortization of Premiums and Discounts on Fixed Maturities Decrease in Unearned Premiums, Net Net Cash Used in Investing Activities Payments for proceeds from other investing activities Other, Net Other, Net Other, Net Other, Net Net Cash Used in Financing Activities Purchases of Equity Securities Other Expenses Total Other Comprehensive Income Net of Tax Other Comprehensive Income (Loss), Net of Tax, Period Increase (Decrease) Change During Year, Net of Tax Total Other Comprehensive Income (Loss), Net of Tax Dividends Paid to Shareholders Dividends Paid to Shareholders Dividends Paid to Shareholders Payments For Repurchase Of Common Stock Proceeds from Issuance of Common Stock Under Stock-Based Employee Compensation Plans Tax Exempt Tax Exempt (cost $XX,XXX and $18,720) Tax Exempt (cost $XX,XXX and $18,720) Tax Exempt (cost $18,604 and $18,720) This item represents total tax-exempt debt securities that are categorized as neither held-to-maturity nor trading. Such securities are reported at fair value; unrealized gains and losses of such securities are excluded from earnings and included in other comprehensive income. Taxable Taxable (cost $XX,XXX and $16,470) Taxable (cost $XX,XXX and $16,470) Taxable (cost $16,184 and $16,470) This item represents total taxable debt securities that are categorized as neither held-to-maturity nor trading. Such securities are reported at fair value; unrealized gains and losses of such securities are excluded from earnings and included in other comprehensive income. Taxable, Cost Taxable, Cost This item represents the amortized cost basis of taxable debt securities that are categorized as neither held-to-maturity nor trading. Tax Exempt, Cost Tax Exempt, Cost This item represents the amortized cost basis of tax exempt debt securities that are categorized as neither held-to-maturity nor trading. Purchases of Property and Equipment, Net Segments Information [Text Block] Contingent Liabilities [Text Block] Contingent Liabilities Federal and Foreign Income Tax Purchases of Fixed Maturities Fixed Maturities Fixed Maturities Abstract Fixed Maturities. Shareholders' Equity Liabilities Abstract Assets Abstract Earnings Per Share [Abstract] Losses and Expenses Revenues Abstract Other Comprehensive Income (Loss), Net of Tax Cash Flows from Investing Activities Cash Flows from Financing Activities Cash Flows from Operating Activities Short Term Investments Equity Securities (cost $1,660 and $1,907) Equity Securities (cost $1,221 and $1,215) Accrued Expenses and Other Liabilities Losses and Loss Expenses Other Insurance Operating Costs and Expenses Proceeds From Sale Of Available For Sale Securities, Debt Proceeds from Fixed Maturities - Sales Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities Proceeds from Fixed Maturities - Maturities, Calls and Redemptions Segments Information [Abstract] Segments Information [Abstract] Segments Information. Adoption of New Accounting Pronouncements [Text Block] Fixed Maturities Entity Common Stock, Shares Outstanding (actual number of shares) Corporate Expenses Corporate Expenses The total amount of expenses incurred by the entity related to corporate activities, including interest expese. Total Losses and Expenses Total Losses and Expenses The total amount of losses and expenses recognized during the period. Proceeds from Sales of Equity Securities Proceeds from Sale of Available-for-sale Securities, Equity Total Losses and Expenses Federal and Foreign Income Tax Income Tax Expense (Benefit) Basic Earnings Per Share, Basic Diluted Earnings Per Share, Diluted Long Term Debt Long-term Debt Retained Earnings Retained Earnings (Accumulated Deficit), Beginning Balance Retained Earnings (Accumulated Deficit), Ending Balance Retained Earnings (Accumulated Deficit) Accumulated Other Comprehensive Income Accumulated Other Comprehensive Income Accumulated Other Comprehensive Income Accumulated Other Comprehensive Income (Loss), Net of Tax Net Income Purchases of Property and Equipment, Net Payments to Acquire Property, Plant, and Equipment Proceeds from Issuance of Common Stock Under Stock-Based Employee Compensation Plans Other Invested Assets Other Invested Assets This item represents other invested assets, including private equity limited partnerships, which are carried at the Corporation's equity in the net assets of the partnerships. Unpaid Losses and Loss Expenses Liability for Claims and Claims Adjustment Expense, Property Casualty Liability Paid-In Surplus Additional Paid in Capital, Total Additional Paid in Capital, Beginning Balance Additional Paid in Capital, Ending Balance Additional Paid in Capital Investments in Other Invested Assets, Net Payments for (Proceeds from) Limited Partnership Decrease (Increase) in Short Term Investments, Net Payments for (Proceeds from) Short-term Investments, Total Payments for (Proceeds from) Short-term Investments Change In Net Payable Receivable From Security Transactions Not Settled Increase in Net Payable from Security Transactions Not Settled Increase in Net Payable from Security Transactions Not Settled Increase (Decrease) in Net Payable from Security Transactions Not Settled Change in net receivable or payable from security transactions not settled. Premiums Earned Premiums Earned, Net, Property and Casualty, Total Premiums Earned, Net, Property and Casualty Other, Net Corporate Expenses Income Before Federal and Foreign Income Tax Income (Loss) from Continuing Operations before Income Taxes, Minority Interest, and Income (Loss) from Equity Method Investments Other Invested Assets TOTAL INVESTED ASSETS Investments Other Assets Accrued Expenses and Other Liabilities TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY Liabilities and Stockholders' Equity Increase in Unpaid Losses and Loss Expenses, Net Increase (Decrease) in Property and Casualty Insurance Liabilities Proceeds from Issuance of Common Stock Under Stock-Based Employee Compensation Plans Increase in Short Term Investments, Net Net Cash Used in Investing Activities Net Cash Provided by (Used in) Investing Activities Purchases of Fixed Maturities Purchases of Equity Securities Purchases of Property and Equipment, Net Repurchase of Shares Net Cash Used in Investing Activities Investments in Other Invested Assets, Net Cash Accrued Investment Income Accrued Investment Income Receivable, Total Premiums Receivable Premiums Receivable, at Carrying Value, Total Reinsurance Recoverable on Unpaid Losses and Loss Expenses Prepaid Reinsurance Premiums Deferred Policy Acquisition Costs Deferred Policy Acquisition Costs, Total Deferred Income Tax Deferred Tax Assets, Net, Total Goodwill Goodwill, Beginning Balance Goodwill, Ending Balance Assets Liabilities Unearned Premiums Unearned Premiums, Total Shareholders' Equity Common Stock - $1 Par Value; 371,980,460 Shares Common Stock - $1 Par Value; 371,980,460 Shares Common Stock - $1 Par Value; 371,980,460 Shares Common Stock, Value, Ending Balance Fair Values Of Financial Instruments [Abstract] Fair Values of Financial Instruments [Abstract] Fair Values Of Financial Instruments. Fair Values of Financial Instruments Fair Value Disclosures [Text Block] Cash Flows from Operating Activities Decrease in Unearned Premiums, Net Amortization of Premiums and Discounts on Fixed Maturities Depreciation Cash Flows from Investing Activities Purchases of Fixed Maturities Purchases of Equity Securities Repurchase of Shares Short Term Investments Revenues Investment Income Interest and Dividend Income, Operating, Total Other Revenues Losses and Expenses Losses and Loss Expenses Amortization of Deferred Policy Acquisition Costs Deferred Policy Acquisition Cost, Amortization Expense, Total Other Insurance Operating Costs and Expenses Investment Expenses Other Expenses Other Nonoperating Expense, Total Net Income Per Share Dividends Declared Per Share Adjustments to Reconcile Net Income to Net Cash Provided by Operating Activities Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Commitments And Contingencies 2009 Contingent Liabilities (Note 6) Cash Flows from Financing Activities Other Comprehensive Income (Loss), Net of Tax Comprehensive Income, Net of Tax, Attributable to Parent Earnings Per Share Earnings Per Share [Text Block] Invested Assets Available-for-sale Securities [Text Block] Net Cash Used in Financing Activities Net Cash Provided by (Used in) Financing Activities Net Cash Provided by Operating Activities Net Cash Provided by (Used in) Operating Activities Dividend Payable to Shareholders Dividends Payable Change in Unrealized Appreciation or Depreciation of Investments Other Comprehensive Income, Available-for-sale Securities Adjustment, Net of Tax, Portion Attributable to Parent, Total Other Comprehensive Income, Available-for-sale Securities Adjustment, Net of Tax, Portion Attributable to Parent Other Comprehensive Income, Foreign Currency Transaction and Translation Adjustment, Net of Tax, Portion Attributable to Parent Other Comprehensive Income, Foreign Currency Transaction and Translation Adjustment, Net of Tax, Portion Attributable to Parent, Total Foreign Currency Translation Losses Other Comprehensive Income, Defined Benefit Plans Adjustment, Net of Tax, Portion Attributable to Parent Amortization of Net Loss and Prior Service Cost Included in Net Postretirement Benefit Costs Amortization of Net Loss and Prior Service Cost Included in Net Postretirment Benefit Costs Adoption of New Accounting Pronouncements Segments Information Cash at Beginning of Year Cash at End of Period Entity Registrant Name Entity Central Index Key Document Type Document Period End Date Amendment Flag Current Fiscal Year End Date Entity Well-known Seasoned Issuer Entity Voluntary Filers Entity Current Reporting Status Entity Filer Category Entity Public Float Revenues Assets Liabilities Stockholders' Equity Cash Period Increase Decrease Net Increase in Cash The net change between the beginning and ending balance of unrestricted cash available for day-to-day operating needs. Accumulated Other Comprehensive Income Balance Sheets [Abstract] Statements of Income [Abstract] Consolidated Statements of Comprehensive Income Statements of Cash Flows [Abstract] Adoption of New Accounting Pronouncements [Abstract] Net Income TOTAL SHAREHOLDERS' EQUITY Balance, Beginning of Year Balance, End of Year Change in Unrealized Other-Than-Temporary Impairment Losses on Investments Change In Unrealized Other Than Temporary Impairments Of Investments This item represents the non-credit impairment losses portion of other-than-temporary impairments on fixed maturity investments in which a credit loss was recognized in the Consolidated Statements of Income. This item includes the impact of subsequent changes to these securities such as appreciation or loss in value or subsequent sale of the security. Realized Investment Gains (Losses), Net Realized Gains Losses Net Abstract Realized Gains Losses Net Abstract. Other-Than-Temporary Impairment Losses on Investments Recognized in Other Comprehensive Income Other Than Temporary Impairment Losses On Investments Recognized In Other Comprehensive Income This item represents the non-credit impairment loss portion of the total other-than-temporary impairment losses on investments for fixed maturity investments that the Corporation does not intend to sell or it is not more likely than not the Corporation will be required to sell these securities before they recover to their amortized cost value. This amount offsets the amount included in the total other-than-temporary impairment losses on investments and recognized in accumulated other comprehensive income. Other Realized Gains Losses Net Other Realized Investment Gains (Losses), Net Other Realized Gains (Losses), Net This item represents the net total realized gain (loss) included in earnings for the period as a result of selling or holding invested assets. Total Other-Than-Temporary Impairment Losses on Investments Impairment of Investments Increase (Decrease) in Premiums Receivable Decrease in Premiums Receivable Total Other-Than-Temporary Impairment Losses on Investments Other-Than-Temporary Impairment Losses on Investments Recognized in Other Comprehensive Income Invested Assets [Abstract] Invested Assets Invested Assets Abstract. Equity Securities Cost Equity Securities, Cost This item represents the original cost basis of equity securities. Document Fiscal Year Focus Document Fiscal Period Focus General [Abstract] Contingent Liabilities [Abstract] Contingent Liabilities. Total Revenues Document and Entity Information [Abstract] Document and Entity Information. General [Text Block] General Increase (Decrease) in Funds Held under Reinsurance Agreements Increase (Decrease) in Funds Held Under Deposit Contracts