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Consolidated Statements Of Operations (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Revenues    
Insurance premiums and contract charges earned $ 165,504 $ 166,686
Net investment income 75,675 70,469
Net realized investment gains 393 5,757
Other income 3,051 1,561
Total revenues 244,623 244,473
Benefits, losses and expenses    
Benefits, claims and settlement expenses 107,878 110,601
Interest credited 39,979 37,426
Policy acquisition expenses amortized 17,830 19,167
Operating expenses 37,850 36,989
Interest expense 3,556 3,477
Total benefits, losses and expenses 207,093 207,660
Income before income taxes 37,530 36,813
Income tax expense 10,859 11,006
Net income 26,671 25,807
Net income per share    
Basic $ 0.67 $ 0.65
Diluted $ 0.64 $ 0.62
Weighted average number of shares and equivalent shares (in thousands)    
Basic 39,794 39,749
Diluted 41,546 41,699
Net realized investment gains (losses)    
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 393 5,757
Total $ 393 $ 5,757