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Investments - Reconciliation of Net Unrealized Investment Gains (Losses) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balance     $ 1,567,285  
Ending balance $ 1,639,811 $ 1,499,677 1,639,811 $ 1,499,677
Net unrealized investment gains (losses) on securities        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balance 136,679 210,839 230,448 96,941
Ending balance 279,129 203,077 279,129 203,077
Net unrealized investment gains (losses) on securities | Fixed maturity securities        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balance 149,876 245,319 264,410 111,712
Change in net unrealized investment gains (losses) on fixed maturity securities 174,932 100,693 71,159 240,705
Reclassification of net investment (gains) losses on securities to net income 5,079 (114,925) (5,682) (121,330)
Ending balance $ 329,887 $ 231,087 $ 329,887 $ 231,087