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CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Revenues |  |  |
Insurance premiums and contract charges earned | $ 817,333 | $ 794,703 | $ 759,146
Net investment income | 376,507 | 373,630 | 361,186
Net investment gains (losses) | (12,543) | (3,406) | 4,123
Other income | 10,302 | 6,623 | 4,455
Total revenues | 1,191,599 | 1,171,550 | 1,128,910
Benefits, losses and expenses |  |  |
Benefits, claims and settlement expenses | 637,560 | 582,306 | 541,004
Interest credited | 206,199 | 198,635 | 192,022
DAC amortization expense | 109,889 | 102,185 | 96,732
Operating expenses | 205,413 | 187,789 | 173,112
Interest expense | 13,001 | 11,948 | 11,808
Total benefits, losses and expenses | 1,172,062 | 1,082,863 | 1,014,678
Income before income taxes | 19,537 | 88,687 | 114,232
Income tax expense (benefit) | 1,194 | (80,772) | 30,467
Net income | $ 18,343 | $ 169,459 | $ 83,765
Net income per share |  |  |
Basic (in usd per share) | $ 0.44 | $ 4.10 | $ 2.04
Diluted (in usd per share) | $ 0.44 | $ 4.08 | $ 2.02
Weighted average number of shares and equivalent shares |  |  |
Basic (in shares) | 41,570,492 | 41,364,546 | 41,158,349
Diluted (in shares) | 41,894,232 | 41,564,979 | 41,475,516
Net investment gains (losses) |  |  |
Total other-than-temporary impairment losses on securities | $ (1,530) | $ (12,620) | $ (11,401)
Portion of losses recognized in other comprehensive income (loss) | 0 | 0 | (290)
Net other-than-temporary impairment losses on securities recognized in earnings | (1,530) | (12,620) | (11,111)
Sales and other, net | 3,491 | 7,756 | 16,286
Change in fair value - equity securities | (18,323) | 0 | 0
Change in fair value and gains realized on settlements - derivative instruments | 3,819 | 1,458 | (1,052)
Total | $ (12,543) | $ (3,406) | $ 4,123

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