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CONSOLIDATED STATEMENTS OF OPERATIONS (UNAUDITED) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Revenues        
Insurance premiums and contract charges earned $ 179,030 $ 173,761 $ 533,571 $ 514,480
Net investment income 82,591 78,466 247,040 233,230
Net realized investment gains (losses) 3,511 (1,407) 8,673 20,872
Other income 388 1,064 2,244 3,470
Total revenues 265,520 251,884 791,528 772,052
Benefits, losses and expenses        
Benefits, claims and settlement expenses 117,443 112,701 356,589 346,165
Interest credited 44,477 42,924 131,294 126,430
Policy acquisition expenses amortized 24,477 20,911 70,027 63,985
Operating expenses 39,875 41,407 119,033 119,239
Interest expense 3,543 3,553 10,635 10,656
Total benefits, losses and expenses 229,815 221,496 687,578 666,475
Income before income taxes 35,705 30,388 103,950 105,577
Income tax expense 10,348 6,789 29,775 28,971
Net income 25,357 23,599 74,175 76,606
Net income per share        
Basic $ 0.61 $ 0.59 $ 1.79 $ 1.93
Diluted $ 0.60 $ 0.57 $ 1.76 $ 1.85
Weighted average number of shares and equivalent shares (in thousands)        
Basic 41,514 40,001 41,353 39,767
Diluted 42,319 41,732 42,155 41,363
Net realized investment gains (losses)        
Total other-than-temporary impairment losses on securities (185) (11) (637) (974)
Portion of losses recognized in other comprehensive income 0 0 0 0
Net other-than-temporary impairment losses on securities recognized in earnings (185) (11) (637) (974)
Realized gains (losses), net 3,696 (1,396) 9,310 21,846
Total $ 3,511 $ (1,407) $ 8,673 $ 20,872