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Parent Corporation Balance Sheet (Details) - USD ($) | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
--- | --- | --- | --- | ---
ASSETS |  |  |  |
Fixed income securities, available-for-sale – at fair value (amortized cost: $61,794 - 2015; $49,890 – 2014) | $ 4,408,203,000 | $ 4,066,122,000 |  |
Short-term investments | 194,819,000 | 131,972,000 |  |
Cash | 898,000 | 23,959,000 | $ 193,000 | $ 210,000
Deferred federal income tax | 92,696,000 | 98,449,000 |  |
Other assets | 78,339,000 | 66,607,000 |  |
Total assets | 6,904,433,000 | 6,574,942,000 |  |
Liabilities: |  |  |  |
Notes payable | 388,192,000 | 372,689,000 |  |
Other liabilities | 255,984,000 | 190,675,000 |  |
Total liabilities | 5,506,392,000 | 5,299,356,000 |  |
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: 100,861,372 - 2015; 99,947,933 - 2014 | 201,723,000 | 199,896,000 |  |
Additional paid-in capital | 326,656,000 | 305,385,000 |  |
Retained earnings | 1,446,192,000 | 1,313,440,000 |  |
Accumulated other comprehensive income (loss) | (9,425,000) | 19,788,000 |  |
Treasury stock - at cost (shares: 43,500,642 - 2015; 43,353,181 - 2014) | (567,105,000) | (562,923,000) |  |
Total stockholders’ equity | 1,398,041,000 | 1,275,586,000 | 1,153,928,000 |
Total liabilities and stockholders’ equity | 6,904,433,000 | 6,574,942,000 |  |
Parent Company [Member] |  |  |  |
ASSETS |  |  |  |
Fixed income securities, available-for-sale – at fair value (amortized cost: $61,794 - 2015; $49,890 – 2014) | 61,567,000 | 50,028,000 |  |
Short-term investments | 29,116,000 | 16,605,000 |  |
Cash | 898,000 | 16,367,000 | $ 193,000 | $ 210,000
Investment in subsidiaries | 1,716,681,000 | 1,604,162,000 |  |
Current federal income tax | 18,297,000 | 16,848,000 |  |
Deferred federal income tax | 17,513,000 | 15,781,000 |  |
Other assets | 670,000 | 660,000 |  |
Total assets | 1,844,742,000 | 1,720,451,000 |  |
Liabilities: |  |  |  |
Notes payable | 328,192,000 | 327,689,000 |  |
Intercompany notes payable | 86,163,000 | 88,961,000 |  |
Accrued long-term stock compensation | 26,465,000 | 21,890,000 |  |
Other liabilities | 5,881,000 | 6,325,000 |  |
Total liabilities | 446,701,000 | 444,865,000 |  |
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: 100,861,372 - 2015; 99,947,933 - 2014 | 201,723,000 | 199,896,000 |  |
Additional paid-in capital | 326,656,000 | 305,385,000 |  |
Retained earnings | 1,446,192,000 | 1,313,440,000 |  |
Accumulated other comprehensive income (loss) | (9,425,000) | 19,788,000 |  |
Treasury stock - at cost (shares: 43,500,642 - 2015; 43,353,181 - 2014) | (567,105,000) | (562,923,000) |  |
Total stockholders’ equity | 1,398,041,000 | 1,275,586,000 |  |
Total liabilities and stockholders’ equity | $ 1,844,742,000 | $ 1,720,451,000 |  |

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