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Investments - Net Unrealized Investment Gains and Losses on Fixed Maturities and Equity Securities (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balance $ 1,567,285 $ 1,290,550  
Ending balance 1,790,079 1,567,285 $ 1,290,550
Cumulative effect of change in accounting principle      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balance 0 0 (15,041)
Ending balance   0 0
Net unrealized investment gains (losses) on securities      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balance 230,448 96,941 300,177
Ending balance 366,285 230,448 96,941
Net unrealized investment gains (losses) on securities | Cumulative effect of change in accounting principle      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balance     (15,041)
Net unrealized investment gains (losses) on securities | Fixed maturity securities      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balance 264,410 111,712 286,176
Change in net unrealized investment gains (losses) on fixed maturity securities 184,290 277,062 (172,350)
Reclassification of net investment (gains) losses on securities to net income (8,876) (124,364) 12,927
Ending balance $ 439,824 $ 264,410 $ 111,712