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CONSOLIDATED STATEMENTS OF OPERATIONS (UNAUDITED) - USD ($) shares in Thousands, $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Revenues |  |  |  |
Insurance premiums and contract charges earned | $ 205,610 | $ 195,718 | $ 408,608 | $ 391,440
Net investment income | 97,101 | 91,994 | 188,965 | 182,705
Net investment gains (losses) | 735 | 2,072 | (919) | 1,830
Other income | 2,811 | 1,652 | 5,092 | 2,765
Total revenues | 306,257 | 291,436 | 601,746 | 578,740
Benefits, losses and expenses |  |  |  |
Benefits, claims and settlement expenses | 168,278 | 165,879 | 311,840 | 309,975
Interest credited | 51,071 | 49,348 | 101,105 | 98,122
DAC amortization expense | 26,586 | 24,808 | 53,291 | 49,694
Operating expenses | 50,218 | 46,228 | 98,387 | 94,984
Interest expense | 3,291 | 2,945 | 6,464 | 5,901
Total benefits, losses and expenses | 299,444 | 289,208 | 571,087 | 558,676
Income before income taxes | 6,813 | 2,228 | 30,659 | 20,064
Income tax expense (benefit) | 896 | (33) | 4,587 | 2,485
Net income | $ 5,917 | $ 2,261 | $ 26,072 | $ 17,579
Net income per share |  |  |  |
Basic (in usd per share) | $ 0.14 | $ 0.05 | $ 0.63 | $ 0.43
Diluted (in usd per share) | $ 0.14 | $ 0.05 | $ 0.63 | $ 0.42
Weighted average number of shares and equivalent shares |  |  |  |
Basic (in shares) | 41,600 | 41,368 | 41,531 | 41,268
Diluted (in shares) | 41,735 | 41,493 | 41,659 | 41,416
Net investment gains (losses) |  |  |  |
Total other-than-temporary impairment losses on securities | $ (1,177) | $ (3,564) | $ (1,287) | $ (1,777)
Portion of losses recognized in other comprehensive income | 0 | 0 | 0 | (4,583)
Net other-than-temporary impairment losses on securities recognized in earnings | (1,177) | (3,564) | (1,287) | (6,360)
Sales and other, net | 1,789 | 5,202 | 3,992 | 7,685
Change in fair value - equity securities | (1,156) | 0 | (6,342) | 0
Change in fair value and gains (losses) realized on settlements - derivative instruments | 1,279 | 434 | 2,718 | 505
Net investment gains (losses) | $ 735 | $ 2,072 | $ (919) | $ 1,830

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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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