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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)