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Parent Corporation Balance Sheet (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | --- | --- | ---
ASSETS |  |  |  |
Fixed income securities, available-for-sale – at fair value (amortized cost: $233,753 – 2019; $111,208 – 2018) | $ 6,095,620 | $ 5,273,100 |  |
Short-term investments | 282,490 | 323,864 |  |
Cash | 300 | 505 |  |
Deferred federal income tax | 6,776 | 53,540 |  |
Other assets | 128,614 | 76,877 |  |
Total assets | 8,797,150 | 7,952,729 |  |
Liabilities: |  |  |  |
Long-term debt | 550,597 | 439,540 |  |
Other liabilities | 331,547 | 277,579 |  |
Total liabilities | 6,602,214 | 6,160,927 |  |
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: 103,484,159 - 2019; 102,848,394 - 2018 | 206,968 | 205,697 |  |
Additional paid-in capital | 418,521 | 390,315 |  |
Retained earnings | 2,080,529 | 1,858,414 |  |
Accumulated other comprehensive income (loss) | 81,750 | (77,956) |  |
Treasury stock – at cost (shares: 44,023,006 – 2019; 43,899,840 – 2018) | (592,832) | (584,668) |  |
Total stockholders’ equity | 2,194,936 | 1,791,802 | $ 1,712,957 |
Total liabilities and stockholders’ equity | 8,797,150 | 7,952,729 |  |
Parent Company [Member] |  |  |  |
ASSETS |  |  |  |
Fixed income securities, available-for-sale – at fair value (amortized cost: $233,753 – 2019; $111,208 – 2018) | 241,526 | 110,098 |  |
Short-term investments | 36,219 | 35,358 |  |
Cash | 300 | 505 | $ 534 | $ 458
Investment in subsidiaries | 2,416,209 | 2,057,218 |  |
Current federal income tax | 16,116 | 14,161 |  |
Deferred federal income tax | 4,875 | 10,346 |  |
Other assets | 1,692 | 1,186 |  |
Total assets | 2,716,937 | 2,228,872 |  |
Liabilities: |  |  |  |
Long-term debt | 439,860 | 329,540 |  |
Intercompany notes payable | 61,163 | 77,517 |  |
Accrued long-term stock compensation | 8,604 | 21,574 |  |
Other liabilities | 12,374 | 8,439 |  |
Total liabilities | 522,001 | 437,070 |  |
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: 103,484,159 - 2019; 102,848,394 - 2018 | 206,968 | 205,697 |  |
Additional paid-in capital | 418,521 | 390,315 |  |
Retained earnings | 2,080,529 | 1,858,414 |  |
Accumulated other comprehensive income (loss) | 81,750 | (77,956) |  |
Treasury stock – at cost (shares: 44,023,006 – 2019; 43,899,840 – 2018) | (592,832) | (584,668) |  |
Total stockholders’ equity | 2,194,936 | 1,791,802 |  |
Total liabilities and stockholders’ equity | $ 2,716,937 | $ 2,228,872 |  |

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