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Summary of Significant Accounting Policies - Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Beginning balance | $ 1,501,573 | $ 1,293,982 |
Other comprehensive income (loss) before reclassifications | (200,090) | 71,978 | $ 3,912
Amounts reclassified from accumulated other comprehensive income (loss) | 12,927 | 3,161 | (3,364)
Cumulative effect of change in accounting principle | (15,041) | 0 | 0
Reclassification of deferred taxes |  | 47,900 |
Net current period other comprehensive income (loss) | (202,204) | 123,039 | 548
Ending balance | 1,290,550 | 1,501,573 | 1,293,982
Stranded deferred tax assets |  | (2,134) |
Stranded deferred tax liabilities |  | 50,034 |
Retained earnings |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Beginning balance | 1,231,177 | 1,155,732 | 1,116,277
Cumulative effect of change in accounting principle | 15,041 | 0 | 0
Reclassification of deferred taxes | 0 | (47,900) | 0
Ending balance | 1,216,582 | 1,231,177 | 1,155,732
Total |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Beginning balance | 286,960 | 163,921 | 163,373
Cumulative effect of change in accounting principle | (15,041) | 0 | 0
Reclassification of deferred taxes | 0 | 47,900 | 0
Ending balance | 84,756 | 286,960 | 163,921
Unrealized Gains and Losses on Fixed Maturity and Equity Securities |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Beginning balance | 300,177 | 175,738 | 175,167
Other comprehensive income (loss) before reclassifications | (201,122) | 71,244 | 3,935
Amounts reclassified from accumulated other comprehensive income (loss) | 12,927 | 3,161 | (3,364)
Cumulative effect of change in accounting principle | (15,041) |  |
Reclassification of deferred taxes |  | 50,034 |
Net current period other comprehensive income (loss) | (203,236) | 124,439 | 571
Ending balance | 96,941 | 300,177 | 175,738
Defined Benefit Plans |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Beginning balance | (13,217) | (11,817) | (11,794)
Other comprehensive income (loss) before reclassifications | 1,032 | 734 | (23)
Amounts reclassified from accumulated other comprehensive income (loss) | 0 | 0 | 0
Cumulative effect of change in accounting principle | 0 |  |
Reclassification of deferred taxes |  | (2,134) |
Net current period other comprehensive income (loss) | 1,032 | (1,400) | (23)
Ending balance | $ (12,185) | $ (13,217) | $ (11,817)

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