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Parent Corporation Balance Sheet (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
ASSETS        
Fixed Income Securities, Available-for-sale, at fair value $ 6,455,928 $ 6,095,620    
Equity securities 310,367 72,937    
Short-term investments 409,852 282,490    
Other investments 266,322 216,807    
Cash 394 300    
Deferred federal income tax 0 6,776    
Other assets 153,919 128,614    
Total assets 9,687,913 8,797,150    
Liabilities:        
Long-term debt 550,743 550,597    
Other liabilities 363,670 331,547    
Total liabilities 6,949,024 6,602,214    
Stockholders’ Equity:        
Preferred stock of $0 par value per share (Note 17): Authorized shares: 5,000,000; Issued shares: 8,000 with $25,000 liquidation preference per share - 2020; no shares issued or outstanding - 2019 200,000 0    
Common stock of $2 par value per share Authorized shares: 360,000,000 Issued: 104,032,912 - 2020; 103,484,159 - 2019 208,066 206,968    
Additional paid-in capital 438,985 418,521    
Retained earnings 2,271,537 2,080,529    
Accumulated other comprehensive income 220,186 81,750    
Treasury Stock, at cost (599,885) (592,832)    
Total stockholders’ equity 2,738,889 2,194,936 $ 1,791,802  
Total liabilities and stockholders’ equity 9,687,913 8,797,150    
Parent Company [Member]        
ASSETS        
Fixed Income Securities, Available-for-sale, at fair value 290,428 241,526    
Equity securities 159,524 0    
Short-term investments 36,425 36,219    
Other investments 3,392 0    
Cash 394 300 $ 505 $ 534
Investment in subsidiaries 2,754,012 2,416,209    
Current federal income tax 11,040 16,116    
Deferred federal income tax 2,218 4,875    
Other assets 1,959 1,692    
Total assets 3,259,392 2,716,937    
Liabilities:        
Long-term debt 440,235 439,860    
Intercompany notes payable 59,611 61,163    
Accrued long-term stock compensation 8,238 8,604    
Other liabilities 12,419 12,374    
Total liabilities 520,503 522,001    
Stockholders’ Equity:        
Preferred stock of $0 par value per share (Note 17): Authorized shares: 5,000,000; Issued shares: 8,000 with $25,000 liquidation preference per share - 2020; no shares issued or outstanding - 2019 200,000 0    
Common stock of $2 par value per share Authorized shares: 360,000,000 Issued: 104,032,912 - 2020; 103,484,159 - 2019 208,066 206,968    
Additional paid-in capital 438,985 418,521    
Retained earnings 2,271,537 2,080,529    
Accumulated other comprehensive income 220,186 81,750    
Treasury Stock, at cost (599,885) (592,832)    
Total stockholders’ equity 2,738,889 2,194,936    
Total liabilities and stockholders’ equity $ 3,259,392 $ 2,716,937