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CONSOLIDATED STATEMENTS OF OPERATIONS (UNAUDITED) - USD ($) shares in Thousands, $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Revenues |  |  |  |
Insurance premiums and contract charges earned | $ 198,935 | $ 191,050 | $ 590,375 | $ 564,860
Net investment income | 92,320 | 94,847 | 275,025 | 270,685
Net realized investment gains (losses) | (3,486) | 3,985 | (1,656) | 6,911
Other income | 2,048 | 1,294 | 4,813 | 3,581
Total revenues | 289,817 | 291,176 | 868,557 | 846,037
Benefits, losses and expenses |  |  |  |
Benefits, claims and settlement expenses | 134,895 | 135,710 | 444,870 | 403,631
Interest credited | 50,078 | 48,658 | 148,200 | 142,924
Policy acquisition expenses amortized | 24,210 | 24,474 | 73,904 | 73,113
Operating expenses | 44,172 | 44,337 | 139,156 | 130,478
Interest expense | 2,978 | 2,975 | 8,879 | 8,858
Total benefits, losses and expenses | 256,333 | 256,154 | 815,009 | 759,004
Income before income taxes | 33,484 | 35,022 | 53,548 | 87,033
Income tax expense | 6,933 | 8,099 | 9,418 | 23,091
Net income | $ 26,551 | $ 26,923 | $ 44,130 | $ 63,942
Net income per share |  |  |  |
Basic (in usd per share) | $ 0.64 | $ 0.66 | $ 1.07 | $ 1.55
Diluted (in usd per share) | $ 0.64 | $ 0.65 | $ 1.06 | $ 1.55
Weighted average number of common and common equivalent shares (in thousands) |  |  |  |
Basic (in shares) | 41,433 | 41,092 | 41,337 | 41,155
Diluted (in shares) | 41,575 | 41,347 | 41,467 | 41,386
Net realized investment gains (losses) |  |  |  |
Total other-than-temporary impairment losses on securities | $ (6,091) | $ (160) | $ (12,452) | $ (7,686)
Portion of losses recognized in other comprehensive income | 0 | 0 | 0 | (290)
Net other-than-temporary impairment losses on securities recognized in earnings | (6,091) | (160) | (12,452) | (7,396)
Realized investment gains, net | 2,605 | 4,145 | 10,796 | 14,307
Total | $ (3,486) | $ 3,985 | $ (1,656) | $ 6,911

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