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Summary of Significant Accounting Policies - Components of Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Organization, Consolidation and Presentation of Financial Statements [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income | $ 125,329 | $ 26,551 | $ 2,261 | $ 15,318 | $ 19,823 | $ 26,923 | $ 11,866 | $ 25,153 | $ 21,040 | $ 21,984 | $ 16,183 | $ 34,275 | $ 169,459 | $ 83,765 | $ 93,482
Change in net unrealized investment gains and losses on fixed maturity and equity securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net unrealized investment gains and losses on fixed maturity and equity securities arising during the period |  |  |  |  |  |  |  |  |  |  |  |  | 105,475 | 6,144 | (178,035)
Less: reclassification adjustment for net gains (losses) included in income before income tax |  |  |  |  |  |  |  |  |  |  |  |  | (4,863) | 5,176 | 11,667
Total, before tax |  |  |  |  |  |  |  |  |  |  |  |  | 110,338 | 968 | (189,702)
Income tax expense (benefit) |  |  |  |  |  |  |  |  |  |  |  |  | 35,933 | 397 | (67,315)
Total, net of tax |  |  |  |  |  |  |  |  |  |  |  |  | 74,405 | 571 | (122,387)
Change in net funded status of benefit plan obligations: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Before tax |  |  |  |  |  |  |  |  |  |  |  |  | 1,461 | (37) | 1,815
Income tax expense (benefit) |  |  |  |  |  |  |  |  |  |  |  |  | 727 | (14) | 656
Total, net of tax |  |  |  |  |  |  |  |  |  |  |  |  | 734 | (23) | 1,159
Total comprehensive income (loss) |  |  |  |  |  |  |  |  |  |  |  |  | $ 244,598 | $ 84,313 | $ (27,746)

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