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CONSOLIDATED STATEMENTS OF INCOME - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Revenues |  |  |
Net premiums | $ 10,543,776 | $ 9,841,130 | $ 9,248,871
Investment income, net of related expenses | 2,138,525 | 2,154,651 | 1,911,886
Investment related gains (losses), net: |  |  |
Other-than-temporary impairments on fixed maturity securities | (28,494) | (42,639) | (38,805)
Other-than-temporary impairments on fixed maturity securities transferred to other comprehensive income | 0 | 0 | 74
Other investment related gains (losses), net | (141,594) | 210,519 | 132,926
Total investment related gains (losses), net | (170,088) | 167,880 | 94,195
Other revenues | 363,451 | 352,108 | 266,559
Total revenues | 12,875,664 | 12,515,769 | 11,521,511
Benefits and expenses |  |  |
Claims and other policy benefits | 9,318,929 | 8,518,917 | 7,993,375
Interest credited | 425,204 | 502,040 | 364,691
Policy acquisition costs and other insurance expenses | 1,322,520 | 1,466,646 | 1,310,540
Other operating expenses | 786,137 | 710,690 | 645,509
Interest expense | 147,355 | 146,025 | 137,623
Collateral finance and securitization expense | 29,699 | 28,636 | 25,827
Total benefits and expenses | 12,029,844 | 11,372,954 | 10,477,565
Income before income taxes | 845,820 | 1,142,815 | 1,043,946
Provision for income taxes | 129,978 | (679,366) | 342,503
Net income | $ 715,842 | $ 1,822,181 | $ 701,443
Earnings per share |  |  |
Basic earnings per share (in dollars per share) | $ 11.25 | $ 28.28 | $ 10.91
Diluted earnings per share (in dollars per share) | $ 11.00 | $ 27.71 | $ 10.79

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