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Other Comprehensive Income (Loss) - Components of 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
Before tax amount:        
Unrealized holding gains (losses) arising during period, before tax $ 119,265 $ 70,449 $ 611,390 $ 573,513
Less reclassification of net realized gains included in net income, before tax 89,204 41,961 411,137 112,121
Foreign currency translation adjustments, before tax 16,918 (16,507) (5,911) (6,454)
Other comprehensive income (loss), before tax 46,979 11,981 194,342 454,938
Tax expense (benefit):        
Unrealized holding gains (losses) arising during period, tax 8,483 11,159 65,099 65,863
Less reclassification of net realized gains included in net income, tax 9,401 3,218 42,714 7,812
Foreign currency translation adjustments, tax 209 (83) (182) 187
Other comprehensive income (loss), tax (709) 7,858 22,203 58,238
Net of tax amount:        
Unrealized holding gains (losses) arising during period, net of tax 110,782 59,290 546,291 507,650
Less reclassification of net realized gains included in net income, net of tax 79,803 38,743 368,423 104,309
Foreign currency translation adjustments, net of tax 16,709 (16,424) (5,729) (6,641)
Net current period other comprehensive income (loss) $ 47,688 $ 4,123 $ 172,139 $ 396,700