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Investments - Reconciliation of Net Unrealized Investment Gains (Losses) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balance     $ 1,567,285  
Ending balance $ 1,715,678 $ 1,578,612 1,715,678 $ 1,578,612
Net unrealized investment gains (losses) on securities        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balance 279,129 203,077 230,448 96,941
Ending balance 328,197 266,381 328,197 266,381
Net unrealized investment gains (losses) on securities | Fixed maturity securities        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balance 329,887 231,087 264,410 111,712
Change in net unrealized investment gains (losses) on fixed maturity securities 56,901 75,283 128,060 315,988
Reclassification of net investment (gains) losses on securities to net income 5,244 (1,330) (438) (122,660)
Ending balance $ 392,032 $ 305,040 $ 392,032 $ 305,040