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CONSOLIDATED STATEMENTS OF OPERATIONS (UNAUDITED) - USD ($) shares in Thousands, $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Revenues |  |  |  |
Insurance premiums and contract charges earned | $ 235,353 | $ 239,681 | $ 697,049 | $ 657,562
Net investment income | 93,718 | 93,071 | 256,403 | 279,329
Net investment gains (losses) | 2,469 | (2,156) | (12,833) | 151,594
Other income | 5,540 | 6,040 | 17,478 | 16,941
Total revenues | 337,080 | 336,636 | 958,097 | 1,105,426
Benefits, losses and expenses |  |  |  |
Benefits, claims and settlement expenses | 151,425 | 154,191 | 433,095 | 446,267
Interest credited | 51,030 | 53,576 | 153,249 | 160,092
Operating expenses | 57,837 | 63,632 | 173,117 | 175,954
DAC unlocking and amortization expense | 24,561 | 26,344 | 74,962 | 82,965
Intangible asset amortization expense | 3,558 | 3,781 | 10,930 | 4,863
Interest expense | 3,553 | 4,608 | 11,722 | 11,223
Other expense - goodwill impairment | 0 | 0 | 0 | 28,025
Total benefits, losses and expenses | 291,964 | 306,132 | 857,075 | 909,389
Income before income taxes | 45,116 | 30,504 | 101,022 | 196,037
Income tax expense | 8,642 | 5,050 | 15,498 | 44,595
Net income | $ 36,474 | $ 25,454 | $ 85,524 | $ 151,442
Net income per share |  |  |  |
Basic (in usd per share) | $ 0.87 | $ 0.61 | $ 2.04 | $ 3.63
Diluted (in usd per share) | $ 0.87 | $ 0.60 | $ 2.03 | $ 3.61
Weighted average number of shares and equivalent shares |  |  |  |
Basic (in shares) | 41,916 | 41,785 | 41,865 | 41,715
Diluted (in shares) | 42,058 | 42,030 | 42,013 | 41,911
Net investment gains (losses) |  |  |  |
Total other-than-temporary impairment losses on securities | $ (1,057) | $ (5) | $ (5,272) | $ (276)
Portion of losses recognized in other comprehensive income (loss) | 0 | 0 | 0 | 0
Net other-than-temporary impairment losses on securities recognized in net income | (1,057) | (5) | (5,272) | (276)
Sales and other, net | 3,736 | 608 | 8,645 | 147,513
Change in fair value - equity securities | 2,242 | 1,081 | (5,644) | 8,029
Change in fair value and gains (losses) realized on settlements - derivatives | (2,452) | (3,840) | (10,562) | (3,672)
Net investment gains (losses) | $ 2,469 | $ (2,156) | $ (12,833) | $ 151,594

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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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