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Other Comprehensive Income - Amounts reclassified from accumulated other comprehensive income (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Reclassification out of Accumulated Other Comprehensive Income [Line Items]                      
Income (loss) before income taxes                 $ 1,577,549 $ 1,849,110 $ 841,772
Income tax (expense) benefit                 (111,838) (155,810) (113,951)
Net of tax $ 543,544 $ 419,039 $ 298,821 $ 144,117 $ 326,384 $ 392,453 $ 468,954 $ 448,528 1,405,521 1,636,319 757,971
Additions for current-period provision for expected credit losses                 (3,597) 0 0
Reclassification out of accumulated other comprehensive income | Unrealized Appreciation on Available-For-Sale Investments                      
Reclassification out of Accumulated Other Comprehensive Income [Line Items]                      
Net realized gains                 478,659 131,043 (153,822)
Other-than-temporary impairment losses                 (533) (3,165) (2,829)
Income (loss) before income taxes                 474,529 127,878 (156,651)
Income tax (expense) benefit                 (48,342) (8,937) 12,078
Net of tax                 426,187 $ 118,941 $ (144,573)
Additions for current-period provision for expected credit losses                 $ (3,597)