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CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Revenues |  |  |
Insurance premiums and contract charges earned | $ 897,954 | $ 817,333 | $ 794,703
Net investment income | 365,064 | 376,507 | 373,630
Net investment gains (losses) | 153,340 | (12,543) | (3,406)
Other income | 14,127 | 10,302 | 6,623
Total revenues | 1,430,485 | 1,191,599 | 1,171,550
Benefits, losses and expenses |  |  |
Benefits, claims and settlement expenses | 585,068 | 637,560 | 582,306
Interest credited | 212,786 | 206,199 | 198,635
Operating expenses | 234,609 | 205,413 | 187,789
DAC unlocking and amortization expense | 109,181 | 109,889 | 102,185
Intangible asset amortization expense | 8,790 | 0 | 0
Interest expense | 15,577 | 13,001 | 11,948
Other expense - goodwill impairment | 28,025 | 0 | 0
Total benefits, losses and expenses | 1,194,036 | 1,172,062 | 1,082,863
Income before income taxes | 236,449 | 19,537 | 88,687
Income tax expense (benefit) | 52,006 | 1,194 | (80,772)
Net income | $ 184,443 | $ 18,343 | $ 169,459
Net income per share |  |  |
Basic (in usd per share) | $ 4.42 | $ 0.44 | $ 4.10
Diluted (in usd per share) | $ 4.40 | $ 0.44 | $ 4.08
Weighted average number of shares and equivalent shares |  |  |
Basic (in shares) | 41,737,876 | 41,570,492 | 41,364,546
Diluted (in shares) | 41,948,531 | 41,894,232 | 41,564,979
Net investment gains (losses) |  |  |
Total other-than-temporary impairment losses on securities | $ (1,380) | $ (1,530) | $ (12,620)
Portion of losses recognized in other comprehensive income (loss) | 0 | 0 | 0
Net other-than-temporary impairment losses on securities recognized in earnings | (1,380) | (1,530) | (12,620)
Sales and other, net | 151,495 | 3,491 | 7,756
Change in fair value - equity securities | 7,308 | (18,323) | 0
Change in fair value and gains realized on settlements - derivatives | (4,083) | 3,819 | 1,458
Total | $ 153,340 | $ (12,543) | $ (3,406)

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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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