Agents' balances and premiums receivable Premiums Receivable, at Carrying Value, Total Premiums Receivable, at Carrying Value Total assets Assets Assets [Abstract] Goodwill Liabilities and Stockholders' Equity [Abstract] Unearned Premiums Reinsurance Payable Long-term Debt Separate Accounts, Liability Liabilities Shareholders' equity: Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest [Abstract] Common Stock, no par value - 200,000,000 shares authorized - 103,483,152 and 105,168,366 shares outstanding Common Stock, Value, Issued Common Stock, Value, Issued, Ending Balance Common Stock, Value, Issued, Beginning Balance Common Stock, Value, Issued, Total Accumulated Other Comprehensive Income (Loss), Net of Tax Accumulated Other Comprehensive Income (Loss), Net of Tax, Ending Balance Accumulated Other Comprehensive Income (Loss), Net of Tax, Beginning Balance Accumulated other comprehensive income, net of tax Stockholders' Equity Attributable to Parent Stockholders' Equity Attributable to Noncontrolling Interest Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest Liabilities and Stockholders' Equity Other Assets Other Receivables Separate Account Assets Variable annuity assets (separate accounts) Consolidated Balance Sheet (Unaudited) [Abstract] Statement [Table] Statement [Line Items] Mortgage Loans on Real Estate, Commercial and Consumer, Net Loans, Gross, Insurance Policy Cash and Cash Equivalents, at Carrying Value Cash and cash equivalents at end of period Cash and cash equivalents at beginning of period Cash and Cash Equivalents, at Carrying Value, Total Cash and cash equivalents Investments and Cash Long-Term Debt [Abstract] Stockholders' Equity Attributable to Parent [Abstract] Shareholders' equity: Common stock, shares authorized Common Stock, Shares Authorized Common stock, shares outstanding Common Stock, Shares, Outstanding Ending Balance, shares Beginning Balance, shares Consolidated Statement of Earnings (Unaudited) [Abstract] Revenues: Revenues [Abstract] Premiums Earned, Net, Property and Casualty Other Income Total revenues Revenues Benefits, Losses and Expenses [Abstract] Other Cost and Expense, Operating Total costs and expenses Benefits, Losses and Expenses Operating Income (Loss) Income Tax Expense (Benefit) Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Net earnings, including noncontrolling interests Net earnings Net Income (Loss) Attributable to Noncontrolling Interest Less: Net earnings (loss) attributable to noncontrolling interests Net Income (Loss) Attributable to Parent Net Earnings Attributable to Shareholders Earnings Per Share [Abstract] Earnings Per Share, Basic Weighted Average Number of Shares Outstanding, Basic Earnings Per Share, Diluted Weighted Average Number of Shares Outstanding, Diluted Other Comprehensive Income, Unrealized Holding Gain (Loss) on Securities Arising During Period, Net of Tax Change in unrealized gain (loss) on securities Change in unrealized gain (loss) on securities Other Comprehensive Income (Loss), Net of Tax [Abstract] Other comprehensive income (loss), net of tax: Consolidated Statement of Changes in Equity (Unaudited) [Abstract] Statement, Equity Components [Axis] Equity Component [Domain] Total Shareholders' Equity Common Shares Common Stock and Capital Surplus Accumulated Other Comprehensive Income (Loss) Noncontrolling Interests Stock Issued During Period, Value, Share-based Compensation Other benefit plans Stock Issued During Period, Value, Stock Options Exercised Stock Issued During Period, Shares, Stock Options Exercised Stock Issued During Period, Shares, Dividend Reinvestment Plan Stock Repurchased and Retired During Period, Value Shares acquired and retired Stock Repurchased and Retired During Period, Shares Cumulative Effect of Initial Adoption of New Accounting Principle Dividends, Common Stock, Cash Dividends on Common Stock Stockholders' Equity, Other Other Consolidated Statement of Cash Flows (Unaudited) [Abstract] Net Cash Provided by (Used in) Operating Activities [Abstract] Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Net purchases of trading securities Proceeds from (Payments for) Trading Securities Increase (Decrease) in Other Operating Assets Other assets Other assets Increase (Decrease) in Reinsurance Payables Payable to reinsurers Increase (Decrease) in Other Operating Liabilities Other liabilities Net Cash Provided by (Used in) Operating Activities Net Cash Provided by (Used in) Investing Activities [Abstract] Payments to Acquire Available-for-sale Securities, Debt Purchases of fixed maturities Purchases of fixed maturities Proceeds from Sale of Available-for-sale Securities, Debt Proceeds from sales of fixed maturities Net Cash Provided by (Used in) Investing Activities Financing Activities: Net Cash Provided by (Used in) Financing Activities [Abstract] Proceeds from Issuance of Common Stock Payments for Repurchase of Common Stock Payments of Dividends, Common Stock Proceeds from (Payments for) Other Financing Activities Other financing activities, net Net cash provided by (used in) financing activities Net Cash Provided by (Used in) Financing Activities Cash and Cash Equivalents, Period Increase (Decrease) Cash and Cash Equivalents, Period Increase (Decrease), Total Net Change in Cash and Cash Equivalents Total liabilities and equity Total equity Beginning Balance Ending Balance Noncontrolling interests Stockholders' Equity Attributable to Noncontrolling Interest, Beginning Balance Stockholders' Equity Attributable to Noncontrolling Interest, Ending Balance Total shareholders' equity Stockholders' Equity Attributable to Parent, Total Stockholders' Equity Attributable to Parent, Beginning Balance Stockholders' Equity Attributable to Parent, Ending Balance Total liabilities Liabilities, Total Variable annuity liabilities (separate accounts) Long-term debt Long-term Debt, Total Payable to reinsurers Unearned premiums Unearned Premiums, Total Liabilities and Equity: Goodwill Goodwill, Beginning Balance Goodwill, Ending Balance Other assets Other Assets, Total Other receivables Total cash and investments Investments and Cash, Total Policy loans Mortgage loans Mortgage Loans on Real Estate, Commercial and Consumer, Net, Total Assets: Annuity Benefits Annuity benefits Annuity benefits Annuity benefits includes 1) interest credited to policyholders accounts, which provides a guaranteed yield, 2) expenses related to excess benefits expected to be paid on future deaths and annuitizations and 3) net expenses related to changes in embedded derivatives on equity indexed annuities offset by equity index call options. Diluted Weighted Average Number of Shares Outstanding, Diluted, Total Basic Weighted Average Number of Shares Outstanding, Basic, Total Average number of Common Shares: Weighted Average Number of Shares Outstanding, Diluted [Abstract] Diluted Basic Earnings Attributable to Shareholders per Common Share: Provision for income taxes Operating earnings before income taxes Operating Income (Loss), Total Other operating and general expenses Other operating and general expenses Costs and Expenses: Revenues, Total Other income Property and casualty insurance premiums Premiums Earned, Net, Property and Casualty, Total Cash dividends paid on Common Stock Repurchases of Common Stock Issuances of Common Stock Net cash used in investing activities Investing Activities: Net cash provided by operating activities Adjustments: Operating Activities: Cash dividends paid on Common Stock Common stock, par value Common Stock, No Par Value Segments of Operations [Abstract] Segments of Operations. Fair Value Measurements [Abstract] Fair Value Measurements. Accounting Policies Significant Accounting Policies [Text Block] Segments of Operations Segment Reporting Disclosure [Text Block] Fair Value Measurements Fair Value Disclosures [Text Block] Derivatives Derivative Instruments and Hedging Activities Disclosure [Text Block] Derivatives [Abstract] Long-Term Debt Long-term Debt [Text Block] Shareholders' Equity Stockholders' Equity Note Disclosure [Text Block] Shareholders' Equity [Abstract] Shares Issued [Abstract] Shares issued: Shares issued. Beginning Balance Shares acquired and retired, shares Dividend reinvestment plan, shares Exercise of stock options, shares Exercise of stock options Cumulative effect of accounting change 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 Entity Common Stock, Shares Outstanding Non-credit Portion Recognized in Other Comprehensive Income (Loss) Non-credit portion recognized in other comprehensive income (loss) Non-credit portion recognized in other comprehensive income (loss). Cash dividends paid on Common Stock Repurchases of Common Stock Investments: Investments [Abstract] Fixed maturities, available for sale at fair value (amortized cost - $18,755 and $18,490) Available-for-sale Securities, Debt Securities Real Estate and Other Investments Real estate and other investments Real estate and other investments Real estate and other investments. Unpaid losses and loss adjustment expenses Liability for Claims and Claims Adjustment Expense, Total Liability for Claims and Claims Adjustment Expense Life, Accident and Health Premiums Life, accident and health premiums Life, accident and health premiums. Marketable Securities, Realized Gain (Loss) Total realized gains (losses) on securities Securities Incurred Claims, Property, Casualty and Liability Property and casualty insurance losses and loss adjustment expenses Cash dividends per Common Share Common Stock, Dividends, Per Share, Declared Marketable Securities, Realized Gain (Loss) [Abstract] Supplemental disclosure of Realized gains (losses) on securities: Impairment charges recognized in earnings Marketable Securities, Realized Gain (Loss), Other than Temporary Impairments, Amount Realized (gains) losses on investing activities Realized Investment Gains (Losses) Realized Investment Gains (Losses), Total Realized (gains) losses on investing activities Proceeds from Maturities, Prepayments and Calls of Available-for-sale Securities Proceeds from maturities and redemptions of fixed maturities Other Comprehensive Income, Foreign Currency Transaction and Translation Adjustment, Net of Tax Change in foreign currency translation Change in foreign currency translation Comprehensive Income, Net of Tax, Including Portion Attributable to Noncontrolling Interest Comprehensive Income, Net of Tax, Including Portion Attributable to Noncontrolling Interest, Total Total comprehensive income (loss) Stock Issued During Period, Shares, Share-based Compensation Other benefit plans, shares Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition, Value Stock-based compensation expense Accounting Policies [Abstract] Investments Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block] Contingencies [Abstract] Interest charges on borrowed money Interest Expense, Total Interest Expense Impairment charges recognized in earnings Decrease (Increase) in Reinsurance and Other Receivables Reinsurance and other receivables Reinsurance and other receivables Decrease (increase) in reinsurance, agent's balances and premiums receivable and other receivables. Other income Impairment charges recognized in earnings Impairment charges recognized in earnings Trading Securities, Debt Fixed maturities, trading at fair value Equity securities, at fair value (cost - $498 and $458) Marketable Securities, Equity Securities Deferred Policy Acquisition Costs and Value of Business Acquired Deferred Policy Acquisition Costs and Value of Business Acquired, Total Deferred policy acquisition costs Liability for Future Policy Benefits, Individual and Group Annuities and Supplementary Contracts Annuity benefits accumulated Life, Accident and Health Reserves Life, accident and health reserves The sum of the known and estimated amounts payable as of the balance sheet date to traditional life insurance policyholders, and under disability and accident insurance contracts, that relate to insured events which can be viewed as either (a) the present value of future benefits to be paid to or on behalf of policyholders and expenses less the present value of future net premiums payable under the insurance contracts or (b) the accumulated amount of net premiums already collected less the accumulated amount of benefits and expenses already paid to or on behalf of policyholders. This sum also includes amounts payable to universal life insurance policyholders for which the liability is equal to the account value. Other Liabilities Other liabilities Retained earnings: Retained Earnings (Accumulated Deficit) [Abstract] Retained Earnings, Unappropriated Unappropriated Retained Earnings, Appropriated Appropriated - managed investment entities Prepaid Reinsurance Premiums Prepaid reinsurance premiums Reinsurance Recoverables Reinsurance Recoverables, Ending Balance Reinsurance Recoverables, Beginning Balance Recoverables from reinsurers Interest and Dividend Income, Operating Interest and Dividend Income, Operating, Total Investment income Income (Loss) of Managed Investment Entities Abstract Income (loss) of managed investment entities: Income (loss) of managed investment entities Abstract. Deferred Policy Acquisition Costs [Abstract] Managed Investment Entities Abstract Managed investment entities: Managed Investment Entities Abstract. Depreciation, Amortization and Accretion, Net Depreciation and amortization Deferred Annuity and Life Policy Acquisition Costs Deferred annuity and life policy acquisition costs Annuity and Life additions during the period in (a) capitalized costs that vary with and are primarily related to the acquisition of new and renewal insurance contracts and coverages, and (b) capitalized present value of future profits (also known as value of business acquired). Increase (Decrease) in Operating Capital [Abstract] Change in: Increase (Decrease) in Insurance Claims and Reserves Insurance claims and reserves The net change in the beginning and end of the period for unpaid losses and loss adjustment expenses, unearned premiums, and life, accident and health reserves needed to adjust net income to arrive at net cash flows provided by (used in) operating activities. Adjustments, Noncash Items, to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities, Other Other operating activities, net Purchases of Real Estate, Property and Equipment Purchases of real estate, property and equipment Purchases of real estate, property and equipment The cash outflow associated with the purchase of real estate held for investment purposes and cash flows associated with the acquisition of long-lived, physical assets that are used in the normal course of business. Proceeds from Annuities and Investment Certificates Annuity receipts Repayments of Annuities and Investment Certificates Annuity surrenders, benefits and withdrawals Payments for (Proceeds from) Other Investing Activities Other investing activities, net Other investing activities, net Other investing activities, net Managed Investment Entities' Retirement of Liabilities Managed investment entities' retirement of liabilities Managed investment entities' retirement of liabilities Managed investment entities' retirement of liabilities. Allocation of Losses of Managed Investment Entities Allocation of losses of managed investment entities Allocation of losses of managed investment entities. Variable Interest, Carrying Amount, Assets Assets of managed investment entities Variable Interest, Carrying Amount, Liabilities Liabilities of managed investment entities Expenses of Managed Investment Entities Expenses of managed investment entities Expenses of managed investment entities. Document Fiscal Year Focus Document Fiscal Period Focus Document and Entity Information [Abstract] Document and Entity Information. Income Taxes [Abstract] Income Tax Disclosure [Text Block] Income Taxes Available-for-sale Securities, Debt Maturities, Amortized Cost Available-for-sale Securities, Debt Maturities, Amortized Cost, Total Fixed maturities, available for sale at amortized cost Retained Earnings Appro. Retained Earnings Unappro. Managed Investment Entities [Abstract] Managed Investment Entities [Abstract] Schedule of Variable Interest Entities [Text Block] Managed Investment Entities Equity Securities, at Cost Equity securities, at cost For an unclassified balance sheet, this item represents investments in common and preferred stocks and other forms of securities that provide ownership interests in a corporation. This disclosure reflects the value of the equity securities at cost, adjusted for other than temporary impairments, where applicable. Realized Gains (Losses) on Securities before Impairments Realized gains before impairments Realized gains (losses) on securities before impairments. Investment Income Of Managed Investment Entities Investment income Investment income Investment income of managed investment entities. Purchases of Investments by Managed Investment Entities Purchases of investments Purchases of investments Purchases of investments by managed investment entities. Proceeds from Sales and Redemptions of Investments by Managed Investment Entities Proceeds from sales and redemptions of investments Proceeds from sales and redemptions of investments by managed investment entities. Additional Paid in Capital, Common Stock Additional Paid in Capital, Common Stock, Ending Balance Additional Paid in Capital, Common Stock, Beginning Balance Capital surplus Deferred Policy Acquisition Costs and Present Value of Future Insurance Profits [Text Block] Deferred Policy Acquisition Costs This element includes data and tables pertaining to (1) the nature and amount of capitalized costs incurred to write or acquire insurance contracts and the accounting for such deferred acquisition costs (DAC) and (2) the nature and amount of the present value of future profits (PVFP) of estimated net cash flows embedded in the existing long-duration contracts of acquired life insurance entities, the amount of amortization and other information pertinent to an understanding of PVFP, which is also known as Value of Business Acquired, or VOBA. Commitments and Contingencies Disclosure [Text Block] Contingencies Schedule of Condensed Financial Statements [Text Block] Condensed Consolidating Information Life, Accident and Health Benefits Life, accident and health benefits Life, accident and health benefits. Annuity and Supplemental Insurance Acquisition Expenses Annuity and supplemental insurance acquisition expenses Annuity and supplemental insurance acquisition expenses. Losses on Securities with Impairment Losses on securities with impairment Losses on securities with impairment Losses on securities with impairment. Property and Casualty Commissions and Other Underwriting Expenses Property and casualty insurance commissions and other underwriting expenses Property and casualty commissions and other underwriting expenses. Loss on Change in Fair Value of Assets and Liabilities of Managed Investment Entities Loss on change in fair value of assets/liabilities Loss on change in fair value of assets/liabilities Loss on change in fair value of assets and liabilities of managed investment entities. Payments to Acquire Available-for-sale Securities, Equity Purchases of equity securities Proceeds from Sale of Available-for-sale Securities, Equity Proceeds from sales of equity securities Payments to Acquire Mortgage Notes Receivable Purchases of mortgage loans Proceeds from Sale and Collection of Mortgage Notes Receivable Proceeds from repayments of mortgage loans Proceeds from Sales of Real Estate, Property and Equipment Proceeds from sales of real estate, property and equipment Cash received from the sale of real estate that is held for investment and cash received from the sale of long-lived, physical assets that are used in the normal course of business. Acquisition [Abstract] Goodwill and Other Intangibles Goodwill and Intangible Assets Disclosure [Text Block] Acquisition Business Combination Disclosure [Text Block] Goodwill and Other Intangibles [Abstract] Goodwill and intangible assets.