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Parent Corporation Balance Sheet (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Assets:        
Fixed maturity securities, available-for-sale – at fair value (amortized cost: $40,701 – 2012; $19,542 - 2011) $ 3,296,013 $ 2,897,373    
Short-term investments 214,479 217,044    
Cash 210 762 645 811
Current federal income tax 2,569 731    
Deferred federal income tax 119,136 119,486    
Other assets 57,661 52,835    
Total assets 6,794,216 5,685,469    
Liabilities:        
Notes payable 307,387 307,360    
Other liabilities 200,194 148,569    
Total liabilities 5,703,624 4,627,141    
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: 98,194,224 - 2012; 97,246,711 - 2011 196,388 194,494    
Additional paid-in capital 270,654 257,370    
Retained earnings 1,125,154 1,116,319    
Accumulated other comprehensive income 54,040 42,294 7,024  
Treasury stock - at cost (shares: 43,030,776 - 2012; 42,836,201 - 2011) (555,644) (552,149)    
Total stockholders' equity 1,090,592 1,058,328 1,018,041  
Total liabilities and stockholders' equity 6,794,216 5,685,469    
Parent Company [Member]
        
Assets:        
Fixed maturity securities, available-for-sale – at fair value (amortized cost: $40,701 – 2012; $19,542 - 2011) 41,202 19,768    
Short-term investments 26,787 33,948    
Cash 210 722 605 77
Investment in subsidiaries 1,356,701 1,338,070    
Current federal income tax 8,133 13,030    
Deferred federal income tax 19,840 10,590    
Other assets 9,695 12,823    
Total assets 1,462,568 1,428,951    
Liabilities:        
Notes payable 249,387 249,360    
Intercompany notes payable 103,443 107,131    
Other liabilities 19,146 14,132    
Total liabilities 371,976 370,623    
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: 98,194,224 - 2012; 97,246,711 - 2011 196,388 194,494    
Additional paid-in capital 270,654 257,370    
Retained earnings 1,125,154 1,116,319    
Accumulated other comprehensive income 54,040 42,294    
Treasury stock - at cost (shares: 43,030,776 - 2012; 42,836,201 - 2011) (555,644) (552,149)    
Total stockholders' equity 1,090,592 1,058,328    
Total liabilities and stockholders' equity $ 1,462,568 $ 1,428,951