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Consolidated Statements Of Operations (USD $)
In Thousands, except Per Share data
 3 Months Ended 6 Months Ended
Jun. 30, 2011
Jun. 30, 2010
Jun. 30, 2011
Jun. 30, 2010
Revenues        
Insurance premiums and contract charges earned $ 166,345 $ 168,430 $ 333,031 $ 334,783
Net investment income 71,689 69,065 142,158 134,983
Net realized investment gains 5,796 8,376 11,553 13,243
Other income 1,521 2,143 3,082 3,678
Total revenues 245,351 248,014 489,824 486,687
Benefits, losses and expenses        
Benefits, claims and settlement expenses 163,809 118,381 274,410 231,298
Interest credited 38,273 36,220 75,699 71,778
Policy acquisition expenses amortized 22,769 25,826 43,790 45,891
Operating expenses 33,727 33,394 68,658 68,190
Interest expense 3,477 3,481 6,954 6,953
Total benefits, losses and expenses 262,055 217,302 469,511 424,110
Income (loss) before income taxes (16,704) 30,712 20,313 62,577
Income tax expense (benefit) (4,887) 7,731 6,189 16,993
Net income (loss) (11,817) 22,981 14,124 45,584
Net income per share        
Basic $ (0.30) $ 0.59 $ 0.35 $ 1.16
Diluted $ (0.30) $ 0.56 $ 0.34 $ 1.12
Weighted average number of shares and equivalent shares (in thousands)        
Basic 39,893 39,263 39,822 39,235
Diluted 39,893 40,929 41,446 40,855
Net realized investment gains (losses)        
Total other-than-temporary impairment losses on securities   (1,106)   (1,851)
Portion of losses recognized in other comprehensive income   459   459
Net other-than-temporary impairment losses on securities recognized in earnings   (647)   (1,392)
Realized gains 5,796 9,023 11,553 14,635
Total $ 5,796 $ 8,376 $ 11,553 $ 13,243