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CONSOLIDATED STATEMENTS OF OPERATIONS (UNAUDITED) - USD ($) shares in Thousands, $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Revenues |  |
Insurance premiums and contract charges earned | $ 202,998 | $ 195,722
Net investment income | 91,864 | 90,711
Net investment losses | (1,654) | (242)
Other income | 2,281 | 1,113
Total revenues | 295,489 | 287,304
Benefits, losses and expenses |  |
Benefits, claims and settlement expenses | 143,562 | 144,096
Interest credited | 50,035 | 48,774
DAC amortization expense | 26,705 | 24,886
Operating expenses | 48,169 | 48,756
Interest expense | 3,172 | 2,956
Total benefits, losses and expenses | 271,643 | 269,468
Income before income taxes | 23,846 | 17,836
Income tax expense | 3,691 | 2,518
Net income | $ 20,155 | $ 15,318
Net income per share |  |
Basic (in usd per share) | $ 0.49 | $ 0.37
Diluted (in usd per share) | $ 0.48 | $ 0.37
Weighted average number of shares and equivalent shares |  |
Basic (in shares) | 41,497 | 41,135
Diluted (in shares) | 41,653 | 41,342
Net investment losses |  |
Total other-than-temporary impairment losses on securities | $ (110) | $ (2,797)
Portion of losses recognized in other comprehensive income | 0 | 0
Net other-than-temporary impairment losses on securities recognized in earnings | 0 | (1,777)
Net other-than-temporary impairment losses on securities recognized in earnings | (110) | (2,797)
Sales and other | 2,203 | 2,484
Change in fair value - equity securities (1) | (5,186) | 0
Change in fair value and gains (losses) realized on settlements - derivative instruments | 1,439 | 71
Net investment losses | $ (1,654) | $ (242)

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- Definition Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=96947427&loc=d3e1448-109256 + Details
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Period Type: | duration