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Parent Corporation Balance Sheet (Details) - USD ($) | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | --- | --- | ---
ASSETS |  |  |  |
Fixed income securities, available-for-sale – at fair value (amortized cost: $89,799 – 2017; $73,471 – 2016) | $ 5,162,522,000 | $ 4,792,540,000 |  |
Short-term investments | 165,555,000 | 221,701,000 |  |
Cash | 534,000 | 458,000 | $ 898,000 | $ 23,959,000
Current federal income tax | 3,243,000 | 2,486,000 |  |
Deferred federal income tax | 31,990,000 | 84,840,000 |  |
Other assets | 122,371,000 | 113,534,000 |  |
Total assets | 7,686,431,000 | 7,355,848,000 |  |
Liabilities: |  |  |  |
Long-term debt | 439,116,000 | 438,667,000 |  |
Other liabilities | 281,624,000 | 298,393,000 |  |
Total liabilities | 5,973,474,000 | 5,824,478,000 |  |
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: 102,284,564 - 2017; 101,620,436 - 2016 | 204,569,000 | 203,241,000 |  |
Additional paid-in capital | 367,717,000 | 347,295,000 |  |
Retained earnings | 1,698,613,000 | 1,568,881,000 |  |
Accumulated other comprehensive income (loss) | 20,170,000 | (15,950,000) |  |
Treasury stock – at cost (shares: 43,789,442 – 2017; 43,653,237 – 2016) | (578,112,000) | (572,097,000) |  |
Total stockholders’ equity | 1,712,957,000 | 1,531,370,000 | 1,398,041,000 |
Total liabilities and stockholders’ equity | 7,686,431,000 | 7,355,848,000 |  |
Parent Company [Member] |  |  |  |
ASSETS |  |  |  |
Fixed income securities, available-for-sale – at fair value (amortized cost: $89,799 – 2017; $73,471 – 2016) | 89,872,000 | 73,509,000 |  |
Short-term investments | 24,080,000 | 17,777,000 |  |
Cash | 534,000 | 458,000 | $ 898,000 | $ 16,367,000
Investment in subsidiaries | 2,013,304,000 | 1,845,410,000 |  |
Current federal income tax | 22,266,000 | 19,766,000 |  |
Deferred federal income tax | 13,239,000 | 19,562,000 |  |
Other assets | 871,000 | 840,000 |  |
Total assets | 2,164,166,000 | 1,977,322,000 |  |
Liabilities: |  |  |  |
Long-term debt | 329,116,000 | 328,667,000 |  |
Intercompany notes payable | 78,443,000 | 79,324,000 |  |
Accrued long-term stock compensation | 37,017,000 | 32,029,000 |  |
Other liabilities | 6,633,000 | 5,932,000 |  |
Total liabilities | 451,209,000 | 445,952,000 |  |
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: 102,284,564 - 2017; 101,620,436 - 2016 | 204,569,000 | 203,241,000 |  |
Additional paid-in capital | 367,717,000 | 347,295,000 |  |
Retained earnings | 1,698,613,000 | 1,568,881,000 |  |
Accumulated other comprehensive income (loss) | 20,170,000 | (15,950,000) |  |
Treasury stock – at cost (shares: 43,789,442 – 2017; 43,653,237 – 2016) | (578,112,000) | (572,097,000) |  |
Total stockholders’ equity | 1,712,957,000 | 1,531,370,000 |  |
Total liabilities and stockholders’ equity | $ 2,164,166,000 | $ 1,977,322,000 |  |

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