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Parent Corporation Balance Sheet (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
ASSETS        
Fixed Income Securities, Available-for-sale, at fair value $ 6,709,976 $ 6,455,928    
Equity securities 335,537 310,367    
Short-term investments 447,863 409,852    
Other investments 409,032 266,322    
Cash 455 394    
Current federal income tax 772 0    
Other assets 195,240 153,919    
Total assets 10,461,389 9,687,913    
Liabilities:        
Long-term debt 506,050 550,743    
Other liabilities 453,874 363,670    
Total liabilities 7,478,504 6,949,024    
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 - 2021; no shares issued or outstanding - 2020 200,000 200,000    
Common stock of $2 par value per share Authorized shares: 360,000,000 Issued: 104,450,916 - 2021; 104,032,912 - 2020 208,902 208,066    
Additional paid-in capital 464,347 438,985    
Retained earnings 2,603,472 2,271,537    
Accumulated other comprehensive income 115,099 220,186    
Treasury Stock, at cost (608,935) (599,885)    
Total stockholders’ equity 2,982,885 2,738,889 $ 2,194,936  
Total liabilities and stockholders’ equity 10,461,389 9,687,913    
Parent Company [Member]        
ASSETS        
Fixed Income Securities, Available-for-sale, at fair value 325,014 290,428    
Equity securities 136,362 159,524    
Short-term investments 56,042 36,425    
Other investments 9,241 3,392    
Cash 455 394 $ 300 $ 505
Investment in subsidiaries 2,954,725 2,754,012    
Current federal income tax 7,208 11,040    
Deferred federal income tax 4,487 2,218    
Other assets 9,178 1,959    
Total assets 3,502,712 3,259,392    
Liabilities:        
Long-term debt 440,600 440,235    
Intercompany notes payable 57,980 59,611    
Accrued long-term stock compensation 10,965 8,238    
Other liabilities 10,282 12,419    
Total liabilities 519,827 520,503    
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 - 2021; no shares issued or outstanding - 2020 200,000 200,000    
Common stock of $2 par value per share Authorized shares: 360,000,000 Issued: 104,450,916 - 2021; 104,032,912 - 2020 208,902 208,066    
Additional paid-in capital 464,347 438,985    
Retained earnings 2,603,472 2,271,537    
Accumulated other comprehensive income 115,099 220,186    
Treasury Stock, at cost (608,935) (599,885)    
Total stockholders’ equity 2,982,885 2,738,889    
Total liabilities and stockholders’ equity $ 3,502,712 $ 3,259,392