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Consolidated Statements of Operations (Unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended
--- | ---
Mar. 31, 2013 | Mar. 31, 2012
Revenues |  |
Insurance premiums and contract charges earned | $ 169,158 | $ 165,504
Net investment income | 77,403 | 75,675
Net realized investment gains | 6,862 | 393
Other income | 1,108 | 3,051
Total revenues | 254,531 | 244,623
Benefits, losses and expenses |  |
Benefits, claims and settlement expenses | 112,699 | 107,878
Interest credited | 41,408 | 39,979
Policy acquisition expenses amortized | 20,074 | 17,830
Operating expenses | 38,818 | 37,850
Interest expense | 3,554 | 3,556
Total benefits, losses and expenses | 216,553 | 207,093
Income before income taxes | 37,978 | 37,530
Income tax expense | 10,966 | 10,859
Net income | 27,012 | 26,671
Net income per share |  |
Basic | $ 0.68 | $ 0.67
Diluted | $ 0.66 | $ 0.64
Weighted average number of shares and equivalent shares (in thousands) |  |
Basic | 39,527 | 39,794
Diluted | 41,088 | 41,546
Net realized investment gains |  |
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, net | 6,862 | 393
Total | $ 6,862 | $ 393

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