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Parent Corporation Balance Sheet (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | --- | --- | ---
ASSETS |  |  |  |
Fixed income securities, available-for-sale – at fair value (amortized cost: $111,208 – 2018; $89,799 – 2017) | $ 5,273,100 | $ 5,162,522 |  |
Short-term investments | 323,864 | 165,555 |  |
Cash | 505 | 534 |  |
Current federal income tax | 0 | 3,243 |  |
Deferred federal income tax | 53,540 | 31,990 |  |
Other assets | 76,877 | 78,195 |  |
Total assets | 7,952,729 | 7,686,431 |  |
Liabilities: |  |  |  |
Long-term debt | 439,540 | 439,116 |  |
Other liabilities | 277,579 | 281,624 |  |
Total liabilities | 6,160,927 | 5,973,474 |  |
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: 102,848,394 - 2018; 102,284,564 - 2017 | 205,697 | 204,569 |  |
Additional paid-in capital | 390,315 | 367,717 |  |
Retained earnings | 1,858,414 | 1,698,613 |  |
Accumulated other comprehensive (loss) income | (77,956) | 20,170 |  |
Treasury stock – at cost (shares: 43,899,840 – 2018; 43,789,442 – 2017) | (584,668) | (578,112) |  |
Total stockholders’ equity | 1,791,802 | 1,712,957 | $ 1,531,370 |
Total liabilities and stockholders’ equity | 7,952,729 | 7,686,431 |  |
Parent Company [Member] |  |  |  |
ASSETS |  |  |  |
Fixed income securities, available-for-sale – at fair value (amortized cost: $111,208 – 2018; $89,799 – 2017) | 110,098 | 89,872 |  |
Short-term investments | 35,358 | 24,080 |  |
Cash | 505 | 534 | $ 458 | $ 898
Investment in subsidiaries | 2,057,218 | 2,013,304 |  |
Current federal income tax | 14,161 | 22,266 |  |
Deferred federal income tax | 10,346 | 13,239 |  |
Other assets | 1,186 | 871 |  |
Total assets | 2,228,872 | 2,164,166 |  |
Liabilities: |  |  |  |
Long-term debt | 329,540 | 329,116 |  |
Intercompany notes payable | 77,517 | 78,443 |  |
Accrued long-term stock compensation | 21,574 | 37,017 |  |
Other liabilities | 8,439 | 6,633 |  |
Total liabilities | 437,070 | 451,209 |  |
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: 102,848,394 - 2018; 102,284,564 - 2017 | 205,697 | 204,569 |  |
Additional paid-in capital | 390,315 | 367,717 |  |
Retained earnings | 1,858,414 | 1,698,613 |  |
Accumulated other comprehensive (loss) income | (77,956) | 20,170 |  |
Treasury stock – at cost (shares: 43,899,840 – 2018; 43,789,442 – 2017) | (584,668) | (578,112) |  |
Total stockholders’ equity | 1,791,802 | 1,712,957 |  |
Total liabilities and stockholders’ equity | $ 2,228,872 | $ 2,164,166 |  |

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