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Other Comprehensive Income (Loss) - Amounts reclassified from accumulated other comprehensive income (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Provision for credit losses $ (229)   $ (10,578)  
Other-than-temporary impairment losses 0 $ (1,163) (533) $ (2,521)
Income (loss) before income taxes 512,389 437,305 944,176 1,509,006
Income tax expense (23,707) (38,116) (77,779) (128,474)
Net of tax 419,039 392,453 861,977 1,309,935
Reclassification out of accumulated other comprehensive income | Unrealized appreciation on available-for-sale investments        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Net realized gains (losses) 87,871 43,124 416,432 114,642
Provision for credit losses 1,333 (4,762)
Other-than-temporary impairment losses 0 (1,163) (533) (2,521)
Income (loss) before income taxes 89,204 41,961 411,137 112,121
Income tax expense (9,401) (3,218) (42,714) (7,812)
Net of tax $ 79,803 $ 38,743 $ 368,423 $ 104,309