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CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Revenues        
Insurance premiums and contract charges earned $ 191,050 $ 182,812 $ 564,860 $ 544,927
Net investment income 94,847 81,016 270,685 248,324
Net realized investment gains 3,985 1,308 6,911 8,789
Other income 1,294 617 3,581 2,302
Total revenues 291,176 265,753 846,037 804,342
Benefits, losses and expenses        
Benefits, claims and settlement expenses 135,710 121,181 403,631 368,139
Interest credited 48,658 46,216 142,924 136,103
Policy acquisition expenses amortized 24,474 25,709 73,113 73,400
Operating expenses 44,337 39,647 130,478 115,611
Interest expense 2,975 2,652 8,858 9,610
Total benefits, losses and expenses 256,154 235,405 759,004 702,863
Income before income taxes 35,022 30,348 87,033 101,479
Income tax expense 8,099 8,364 23,091 29,037
Net income $ 26,923 $ 21,984 $ 63,942 $ 72,442
Net income per share        
Basic $ 0.66 $ 0.53 $ 1.55 $ 1.73
Diluted $ 0.65 $ 0.52 $ 1.55 $ 1.71
Weighted average number of shares and equivalent shares (in thousands)        
Basic 41,092 41,852 41,155 41,965
Diluted 41,347 42,305 41,386 42,362
Net realized investment gains (losses)        
Total other-than-temporary impairment losses on securities $ (160) $ (3,602) $ (7,686) $ (20,860)
Portion of losses recognized in other comprehensive income 0 0 (290) (4,300)
Net other-than-temporary impairment losses on securities recognized in earnings (160) (3,602) (7,396) (16,560)
Realized gains, net 4,145 4,910 14,307 25,349
Total $ 3,985 $ 1,308 $ 6,911 $ 8,789