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Parent Corporation Balance Sheet (Details) - USD ($)
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
ASSETS        
Fixed income securities, available-for-sale – at fair value (amortized cost: $61,794 - 2015; $49,890 – 2014) $ 4,408,203,000 $ 4,066,122,000    
Short-term investments 194,819,000 131,972,000    
Cash 898,000 23,959,000 $ 193,000 $ 210,000
Deferred federal income tax 92,696,000 98,449,000    
Other assets 78,339,000 66,607,000    
Total assets 6,904,433,000 6,574,942,000    
Liabilities:        
Notes payable 388,192,000 372,689,000    
Other liabilities 255,984,000 190,675,000    
Total liabilities 5,506,392,000 5,299,356,000    
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: 100,861,372 - 2015; 99,947,933 - 2014 201,723,000 199,896,000    
Additional paid-in capital 326,656,000 305,385,000    
Retained earnings 1,446,192,000 1,313,440,000    
Accumulated other comprehensive income (loss) (9,425,000) 19,788,000    
Treasury stock - at cost (shares: 43,500,642 - 2015; 43,353,181 - 2014) (567,105,000) (562,923,000)    
Total stockholders’ equity 1,398,041,000 1,275,586,000 1,153,928,000  
Total liabilities and stockholders’ equity 6,904,433,000 6,574,942,000    
Parent Company [Member]        
ASSETS        
Fixed income securities, available-for-sale – at fair value (amortized cost: $61,794 - 2015; $49,890 – 2014) 61,567,000 50,028,000    
Short-term investments 29,116,000 16,605,000    
Cash 898,000 16,367,000 $ 193,000 $ 210,000
Investment in subsidiaries 1,716,681,000 1,604,162,000    
Current federal income tax 18,297,000 16,848,000    
Deferred federal income tax 17,513,000 15,781,000    
Other assets 670,000 660,000    
Total assets 1,844,742,000 1,720,451,000    
Liabilities:        
Notes payable 328,192,000 327,689,000    
Intercompany notes payable 86,163,000 88,961,000    
Accrued long-term stock compensation 26,465,000 21,890,000    
Other liabilities 5,881,000 6,325,000    
Total liabilities 446,701,000 444,865,000    
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: 100,861,372 - 2015; 99,947,933 - 2014 201,723,000 199,896,000    
Additional paid-in capital 326,656,000 305,385,000    
Retained earnings 1,446,192,000 1,313,440,000    
Accumulated other comprehensive income (loss) (9,425,000) 19,788,000    
Treasury stock - at cost (shares: 43,500,642 - 2015; 43,353,181 - 2014) (567,105,000) (562,923,000)    
Total stockholders’ equity 1,398,041,000 1,275,586,000    
Total liabilities and stockholders’ equity $ 1,844,742,000 $ 1,720,451,000