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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, 2012 | Sep. 30, 2011 | Sep. 30, 2012 | Sep. 30, 2011
Revenues |  |  |  |
Insurance premiums and contract charges earned | $ 167,904 | $ 167,035 | $ 499,743 | $ 500,066
Net investment income | 76,649 | 71,550 | 228,658 | 213,708
Net realized investment gains | 10,762 | 21,121 | 21,060 | 32,674
Other income | 1,233 | 1,127 | 5,936 | 4,209
Total revenues | 256,548 | 260,833 | 755,397 | 750,657
Benefits, losses and expenses |  |  |  |
Benefits, claims and settlement expenses | 106,051 | 124,412 | 344,913 | 398,822
Interest credited | 41,411 | 39,288 | 121,844 | 114,987
Policy acquisition expenses amortized | 20,406 | 25,008 | 60,538 | 64,735
Operating expenses | 37,955 | 36,030 | 114,382 | 109,005
Interest expense | 3,556 | 3,474 | 10,666 | 10,428
Total benefits, losses and expenses. | 209,379 | 228,212 | 652,343 | 697,977
Income before income taxes | 47,169 | 32,621 | 103,054 | 52,680
Income tax expense | 14,903 | 8,984 | 31,014 | 15,087
Net income | 32,266 | 23,637 | 72,040 | 37,593
Net income per share |  |  |  |
Basic | $ 0.82 | $ 0.59 | $ 1.82 | $ 0.94
Diluted | $ 0.78 | $ 0.57 | $ 1.74 | $ 0.91
Weighted average number of shares and equivalent shares (in thousands) |  |  |  |
Basic | 39,381 | 39,919 | 39,572 | 39,854
Diluted | 41,138 | 41,451 | 41,295 | 41,455
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 |  |  |  |
Net realized gains | 10,762 | 21,121 | 21,060 | 32,674
Total | $ 10,762 | $ 21,121 | $ 21,060 | $ 32,674

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- Definition The sum of insurance premiums earned, premiums earned on the income statement for all insurance and reinsurance contracts after subtracting any amounts ceded to another insurer and adding premiums assumed from other insurers, and contract charges earned on investment and universal life-type contracts. + References No definition available. + Details
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