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Other Comprehensive Income (Loss) - Amounts reclassified from accumulated other comprehensive income (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Provision for credit losses $ (59) $ (1,000) $ (2,662) $ (10,349)
Other-than-temporary impairment losses     0 (533)
Income (loss) before income taxes and income (loss) from operating affiliates 745,367 495,689 1,184,478 426,444
Income tax expense (51,179) (26,127) (90,039) (54,072)
Net of tax 675,486 298,821 1,113,642 442,938
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) 64,914 182,329 66,918 328,561
Provision for credit losses 896 3,225 (751) (6,095)
Other-than-temporary impairment losses 0 0 0 (533)
Income (loss) before income taxes and income (loss) from operating affiliates 65,810 185,554 66,167 321,933
Income tax expense (5,263) (18,163) (8,317) (33,313)
Net of tax $ 60,547 $ 167,391 $ 57,850 $ 288,620