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Schedule - Parent Corporation Financial Statements (Balance Sheets) (Details) (USD $) In Thousands, except Share data, unless otherwise specified | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009 | Dec. 31, 2008
--- | --- | --- | --- | ---
Assets Abstract |  |  |  |
Fixed maturity securities, held-to-maturity - at carrying value (fair value: $811 - 2010) | $ 712,348 | $ 1,214,324 |  |
Fixed maturity securities, available-for-sale - at fair value (amortized cost: $19,452 - 2011 | 2,897,373 | 2,342,742 |  |
Short-term investments | 217,044 | 161,155 |  |
Cash | 762 | 645 | 811 | 3,606
Current federal income tax | 731 | 11,200 |  |
Deferred federal income tax | 92,686 | 93,234 |  |
Other assets | 52,227 | 61,529 |  |
Total assets | 5,736,369 | 5,231,772 |  |
Liabilities And Stockholders Equity |  |  |  |
Notes payable | 307,360 | 262,333 |  |
Other liabilities | 148,569 | 143,743 |  |
Total liabilities | 4,627,141 | 4,160,663 |  |
Stockholders' Equity: |  |  |  |
Preferred stock of $0 par value per share: Authorized shares: 5,000,000; no shares issued or outstanding | 0 | 0 |  |
Common stock of $2 par value per share Authorized shares: 360,000,000 Issued: 97,246,711 - 2011; 96,362,667 - 2010 | 194,494 | 192,725 |  |
Additional paid-in capital | 257,370 | 244,613 |  |
Retained earnings | 1,167,219 | 1,176,155 |  |
Accumulated other comprehensive income (loss), net of tax | 42,294 | 7,024 | (12,460) |
Treasury stock - at cost (shares: 42,836,201 - 2011; 42,686,204 - 2010) | (552,149) | (549,408) |  |
Stockholders' Equity | 1,109,228 | 1,071,109 | 1,002,375 |
Total liabilities and stockholders' equity | 5,736,369 | 5,231,772 |  |
Fixed maturity securities, held-to-maturity, fair value | 758,043 | 1,256,294 |  |
Available-for-sale Securities, Amortized Cost | 2,766,856 | 2,285,988 |  |
Preferred stock, par value per share | $ 0 | $ 0 | $ 0 |
Preferred stock, shares authorized | 5,000,000 | 5,000,000 | 5,000,000 |
Preferred stock, shares issued | 0 | 0 | 0 |
Preferred stock, shares outstanding | 0 | 0 |  |
Common stock, par value per share | $ 2 | $ 2 |  |
Common stock, shares authorized | 360,000,000 | 360,000,000 |  |
Common stock, shares issued | 97,246,711 | 96,362,667 |  |
Treasury stock, shares | 42,836,201 | 42,686,204 |  |
Parent Company [Member] |  |  |  |
Assets Abstract |  |  |  |
Fixed maturity securities, held-to-maturity - at carrying value (fair value: $811 - 2010) | 0 | 796 |  |
Fixed maturity securities, available-for-sale - at fair value (amortized cost: $19,452 - 2011 | 19,768 | 0 |  |
Short-term investments | 33,948 | 50,109 |  |
Cash | 722 | 605 | 77 | 0
Investment in subsidiaries | 1,388,970 | 1,320,886 |  |
Current federal income tax | 13,030 | 12,932 |  |
Deferred federal income tax | 10,590 | 11,158 |  |
Other assets | 12,823 | 11,961 |  |
Total assets | 1,479,851 | 1,408,447 |  |
Liabilities And Stockholders Equity |  |  |  |
Notes payable | 249,360 | 249,333 |  |
Intercompany notes payable | 107,131 | 74,785 |  |
Other liabilities | 14,132 | 13,220 |  |
Total liabilities | 370,623 | 337,338 |  |
Stockholders' Equity: |  |  |  |
Preferred stock of $0 par value per share: Authorized shares: 5,000,000; no shares issued or outstanding | 0 | 0 |  |
Common stock of $2 par value per share Authorized shares: 360,000,000 Issued: 97,246,711 - 2011; 96,362,667 - 2010 | 194,494 | 192,725 |  |
Additional paid-in capital | 257,370 | 244,613 |  |
Retained earnings | 1,167,219 | 1,176,155 |  |
Accumulated other comprehensive income (loss), net of tax | 42,294 | 7,024 |  |
Treasury stock - at cost (shares: 42,836,201 - 2011; 42,686,204 - 2010) | (552,149) | (549,408) |  |
Stockholders' Equity | 1,109,228 | 1,071,109 |  |
Total liabilities and stockholders' equity | 1,479,851 | 1,408,447 |  |
Fixed maturity securities, held-to-maturity, fair value |  | 811 |  |
Available-for-sale Securities, Amortized Cost | $ 19,542 |  |  |
Preferred stock, par value per share | $ 0 |  |  |
Preferred stock, shares authorized | 5,000,000 |  |  |
Common stock, par value per share | $ 2 |  |  |
Common stock, shares authorized | 360,000,000 |  |  |
Common stock, shares issued | 97,246,711 | 96,362,667 |  |
Treasury stock, shares | 42,836,201 | 42,686,204 |  |

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