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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