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Parent Corporation Balance Sheet (Details) - USD ($)
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
ASSETS        
Fixed income securities, available-for-sale – at fair value (amortized cost: $89,799 – 2017; $73,471 – 2016) $ 5,162,522,000 $ 4,792,540,000    
Short-term investments 165,555,000 221,701,000    
Cash 534,000 458,000 $ 898,000 $ 23,959,000
Current federal income tax 3,243,000 2,486,000    
Deferred federal income tax 31,990,000 84,840,000    
Other assets 122,371,000 113,534,000    
Total assets 7,686,431,000 7,355,848,000    
Liabilities:        
Long-term debt 439,116,000 438,667,000    
Other liabilities 281,624,000 298,393,000    
Total liabilities 5,973,474,000 5,824,478,000    
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: 102,284,564 - 2017; 101,620,436 - 2016 204,569,000 203,241,000    
Additional paid-in capital 367,717,000 347,295,000    
Retained earnings 1,698,613,000 1,568,881,000    
Accumulated other comprehensive income (loss) 20,170,000 (15,950,000)    
Treasury stock – at cost (shares: 43,789,442 – 2017; 43,653,237 – 2016) (578,112,000) (572,097,000)    
Total stockholders’ equity 1,712,957,000 1,531,370,000 1,398,041,000  
Total liabilities and stockholders’ equity 7,686,431,000 7,355,848,000    
Parent Company [Member]        
ASSETS        
Fixed income securities, available-for-sale – at fair value (amortized cost: $89,799 – 2017; $73,471 – 2016) 89,872,000 73,509,000    
Short-term investments 24,080,000 17,777,000    
Cash 534,000 458,000 $ 898,000 $ 16,367,000
Investment in subsidiaries 2,013,304,000 1,845,410,000    
Current federal income tax 22,266,000 19,766,000    
Deferred federal income tax 13,239,000 19,562,000    
Other assets 871,000 840,000    
Total assets 2,164,166,000 1,977,322,000    
Liabilities:        
Long-term debt 329,116,000 328,667,000    
Intercompany notes payable 78,443,000 79,324,000    
Accrued long-term stock compensation 37,017,000 32,029,000    
Other liabilities 6,633,000 5,932,000    
Total liabilities 451,209,000 445,952,000    
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: 102,284,564 - 2017; 101,620,436 - 2016 204,569,000 203,241,000    
Additional paid-in capital 367,717,000 347,295,000    
Retained earnings 1,698,613,000 1,568,881,000    
Accumulated other comprehensive income (loss) 20,170,000 (15,950,000)    
Treasury stock – at cost (shares: 43,789,442 – 2017; 43,653,237 – 2016) (578,112,000) (572,097,000)    
Total stockholders’ equity 1,712,957,000 1,531,370,000    
Total liabilities and stockholders’ equity $ 2,164,166,000 $ 1,977,322,000