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Parent Corporation Balance Sheet (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
--- | --- | --- | --- | ---
ASSETS |  |  |  |
Fixed maturity securities, available-for-sale – at fair value (amortized cost: $55,447 - 2013; $40,701 – 2012) | $ 3,715,536 | $ 3,296,013 |  |
Short-term investments | 174,251 | 214,479 |  |
Cash | 193 | 210 | 762 | 645
Current federal income tax | 512 | 2,569 |  |
Deferred federal income tax | 122,613 | 119,136 |  |
Other assets | 75,727 | 57,661 |  |
Total assets | 6,270,170 | 6,794,216 |  |
Liabilities: |  |  |  |
Notes payable | 392,414 | 307,387 |  |
Other liabilities | 203,476 | 200,194 |  |
Total liabilities | 5,116,242 | 5,703,624 |  |
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: 99,120,235 - 2013; 98,194,224 - 2012 | 198,240 | 196,388 |  |
Additional paid-in capital | 288,182 | 270,654 |  |
Retained earnings | 1,202,015 | 1,125,154 |  |
Accumulated other comprehensive income | 24,851 | 54,040 |  |
Treasury stock - at cost (shares: 43,198,622 - 2013; 43,030,776 - 2012) | (559,360) | (555,644) |  |
Total stockholders’ equity | 1,153,928 | 1,090,592 | 1,058,328 |
Total liabilities and stockholders’ equity | 6,270,170 | 6,794,216 |  |
Parent Company [Member] |  |  |  |
ASSETS |  |  |  |
Fixed maturity securities, available-for-sale – at fair value (amortized cost: $55,447 - 2013; $40,701 – 2012) | 55,623 | 41,202 |  |
Short-term investments | 15,399 | 26,787 |  |
Cash | 193 | 210 | 722 | 605
Investment in subsidiaries | 1,493,996 | 1,356,701 |  |
Current federal income tax | 28,471 | 8,133 |  |
Deferred federal income tax | 15,122 | 19,840 |  |
Other assets | 9,410 | 9,695 |  |
Total assets | 1,618,214 | 1,462,568 |  |
Liabilities: |  |  |  |
Notes payable | 334,414 | 249,387 |  |
Intercompany notes payable | 102,721 | 103,443 |  |
Other liabilities | 27,151 | 19,146 |  |
Total liabilities | 464,286 | 371,976 |  |
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: 99,120,235 - 2013; 98,194,224 - 2012 | 198,240 | 196,388 |  |
Additional paid-in capital | 288,182 | 270,654 |  |
Retained earnings | 1,202,015 | 1,125,154 |  |
Accumulated other comprehensive income | 24,851 | 54,040 |  |
Treasury stock - at cost (shares: 43,198,622 - 2013; 43,030,776 - 2012) | (559,360) | (555,644) |  |
Total stockholders’ equity | 1,153,928 | 1,090,592 |  |
Total liabilities and stockholders’ equity | $ 1,618,214 | $ 1,462,568 |  |

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