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Parent Corporation Balance Sheet (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
--- | --- | --- | --- | ---
Assets: |  |  |  |
Fixed maturity securities, available-for-sale – at fair value (amortized cost: $40,701 – 2012; $19,542 - 2011) | $ 3,296,013 | $ 2,897,373 |  |
Short-term investments | 214,479 | 217,044 |  |
Cash | 210 | 762 | 645 | 811
Current federal income tax | 2,569 | 731 |  |
Deferred federal income tax | 119,136 | 119,486 |  |
Other assets | 57,661 | 52,835 |  |
Total assets | 6,794,216 | 5,685,469 |  |
Liabilities: |  |  |  |
Notes payable | 307,387 | 307,360 |  |
Other liabilities | 200,194 | 148,569 |  |
Total liabilities | 5,703,624 | 4,627,141 |  |
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: 98,194,224 - 2012; 97,246,711 - 2011 | 196,388 | 194,494 |  |
Additional paid-in capital | 270,654 | 257,370 |  |
Retained earnings | 1,125,154 | 1,116,319 |  |
Accumulated other comprehensive income | 54,040 | 42,294 | 7,024 |
Treasury stock - at cost (shares: 43,030,776 - 2012; 42,836,201 - 2011) | (555,644) | (552,149) |  |
Total stockholders' equity | 1,090,592 | 1,058,328 | 1,018,041 |
Total liabilities and stockholders' equity | 6,794,216 | 5,685,469 |  |
Parent Company [Member] |  |  |  |
Assets: |  |  |  |
Fixed maturity securities, available-for-sale – at fair value (amortized cost: $40,701 – 2012; $19,542 - 2011) | 41,202 | 19,768 |  |
Short-term investments | 26,787 | 33,948 |  |
Cash | 210 | 722 | 605 | 77
Investment in subsidiaries | 1,356,701 | 1,338,070 |  |
Current federal income tax | 8,133 | 13,030 |  |
Deferred federal income tax | 19,840 | 10,590 |  |
Other assets | 9,695 | 12,823 |  |
Total assets | 1,462,568 | 1,428,951 |  |
Liabilities: |  |  |  |
Notes payable | 249,387 | 249,360 |  |
Intercompany notes payable | 103,443 | 107,131 |  |
Other liabilities | 19,146 | 14,132 |  |
Total liabilities | 371,976 | 370,623 |  |
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: 98,194,224 - 2012; 97,246,711 - 2011 | 196,388 | 194,494 |  |
Additional paid-in capital | 270,654 | 257,370 |  |
Retained earnings | 1,125,154 | 1,116,319 |  |
Accumulated other comprehensive income | 54,040 | 42,294 |  |
Treasury stock - at cost (shares: 43,030,776 - 2012; 42,836,201 - 2011) | (555,644) | (552,149) |  |
Total stockholders' equity | 1,090,592 | 1,058,328 |  |
Total liabilities and stockholders' equity | $ 1,462,568 | $ 1,428,951 |  |

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