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Parent Corporation Balance Sheet (Details) - USD ($)
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
ASSETS        
Fixed income securities, available-for-sale – at fair value (amortized cost: $73,471 – 2016; $61,794 – 2015) $ 4,792,540,000 $ 4,408,203,000    
Short-term investments 221,701,000 194,819,000    
Cash 458,000 898,000 $ 23,959,000 $ 193,000
Current federal income tax 2,486,000 0    
Deferred federal income tax 84,840,000 92,696,000    
Other assets 113,534,000 78,339,000    
Total assets 7,355,848,000 6,904,433,000    
Liabilities:        
Long-term debt 438,667,000 328,192,000    
Other liabilities 298,393,000 255,984,000    
Total liabilities 5,824,478,000 5,506,392,000    
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: 101,620,436 - 2016; 100,861,372 - 2015 203,241,000 201,723,000    
Additional paid-in capital 347,295,000 326,656,000    
Retained earnings 1,568,881,000 1,446,192,000    
Accumulated other comprehensive loss (15,950,000) (9,425,000)    
Treasury stock – at cost (shares: 43,653,237 – 2016; 43,500,642 – 2015) (572,097,000) (567,105,000)    
Total stockholders’ equity 1,531,370,000 1,398,041,000 1,275,586,000  
Total liabilities and stockholders’ equity 7,355,848,000 6,904,433,000    
Parent Company [Member]        
ASSETS        
Fixed income securities, available-for-sale – at fair value (amortized cost: $73,471 – 2016; $61,794 – 2015) 73,509,000 61,567,000    
Short-term investments 17,777,000 29,116,000    
Cash 458,000 898,000 $ 16,367,000 $ 193,000
Investment in subsidiaries 1,845,410,000 1,716,681,000    
Current federal income tax 19,766,000 18,297,000    
Deferred federal income tax 19,562,000 17,513,000    
Other assets 840,000 670,000    
Total assets 1,977,322,000 1,844,742,000    
Liabilities:        
Long-term debt 328,667,000 328,192,000    
Intercompany notes payable 79,324,000 86,163,000    
Accrued long-term stock compensation 32,029,000 26,465,000    
Other liabilities 5,932,000 5,881,000    
Total liabilities 445,952,000 446,701,000    
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: 101,620,436 - 2016; 100,861,372 - 2015 203,241,000 201,723,000    
Additional paid-in capital 347,295,000 326,656,000    
Retained earnings 1,568,881,000 1,446,192,000    
Accumulated other comprehensive loss (15,950,000) (9,425,000)    
Treasury stock – at cost (shares: 43,653,237 – 2016; 43,500,642 – 2015) (572,097,000) (567,105,000)    
Total stockholders’ equity 1,531,370,000 1,398,041,000    
Total liabilities and stockholders’ equity $ 1,977,322,000 $ 1,844,742,000