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Consolidated Statements of Operations (USD $)
In Thousands, except Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Revenues      
Insurance premiums and contract charges earned $ 670,527 $ 667,120 $ 672,678
Net investment income 306,003 288,311 272,054
Net realized investment gains 27,298 37,663 23,769
Other income 6,986 5,208 6,213
Total revenues 1,010,814 998,302 974,714
Benefits, losses and expenses      
Benefits, claims and settlement expenses 448,250 502,434 474,833
Interest credited 163,565 154,910 146,723
Policy acquisition expenses amortized 79,519 83,398 77,347
Operating expenses 156,058 148,635 151,690
Interest expense 14,249 14,007 13,953
Total benefits, losses and expenses 861,641 903,384 864,546
Income before income taxes 149,173 94,918 110,168
Income tax expense 45,307 24,412 30,037
Net income 103,866 70,506 80,131
Net income per share      
Basic $ 2.63 $ 1.77 $ 2.04
Diluted $ 2.51 $ 1.70 $ 1.95
Weighted average number of shares and equivalent shares      
Basic 39,513,540 39,865,815 39,349,656
Diluted 41,388,368 41,436,512 41,013,163
Net realized investment gains      
Total other-than-temporary impairment losses on securities   (72) (7,255)
Portion of losses recognized in other comprehensive income     459
Net other-than-temporary impairment loss write-down on securities recognized in earnings   (72) (6,796)
Realized gains, net 27,298 37,735 30,565
Total $ 27,298 $ 37,663 $ 23,769