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Consolidated Statements of Operations (Unaudited) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Revenues    
Insurance premiums and contract charges earned $ 169,158 $ 165,504
Net investment income 77,403 75,675
Net realized investment gains 6,862 393
Other income 1,108 3,051
Total revenues 254,531 244,623
Benefits, losses and expenses    
Benefits, claims and settlement expenses 112,699 107,878
Interest credited 41,408 39,979
Policy acquisition expenses amortized 20,074 17,830
Operating expenses 38,818 37,850
Interest expense 3,554 3,556
Total benefits, losses and expenses 216,553 207,093
Income before income taxes 37,978 37,530
Income tax expense 10,966 10,859
Net income 27,012 26,671
Net income per share    
Basic $ 0.68 $ 0.67
Diluted $ 0.66 $ 0.64
Weighted average number of shares and equivalent shares (in thousands)    
Basic 39,527 39,794
Diluted 41,088 41,546
Net realized investment gains    
Total other-than-temporary impairment losses on securities      
Portion of losses recognized in other comprehensive income      
Net other-than-temporary impairment losses on securities recognized in earnings      
Realized gains, net 6,862 393
Total $ 6,862 $ 393