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Other Comprehensive Income - Components of other comprehensive income (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Before tax amount:      
Unrealized holding gains (losses) arising during period, before tax $ 754,572 $ 562,576 $ (294,267)
Less reclassification of net realized gains (losses) included in net income, before tax 474,529 127,878 (156,651)
Foreign currency translation adjustments, before tax 33,706 18,463 (25,006)
Other comprehensive income (loss), before tax 313,749 453,161 (162,622)
Tax expense (benefit):      
Unrealized holding gains (losses) arising during period, tax 75,855 61,805 (24,210)
Less reclassification of net realized gains (losses) included in net income, tax 48,342 8,937 (12,078)
Foreign currency translation adjustments, tax 370 353 (176)
Other comprehensive income (loss), tax 27,883 53,221 (12,308)
Net of tax amount:      
Unrealized holding gains (losses) arising during period, net of tax 678,717 500,771 (270,057)
Less reclassification of net realized gains (losses) included in net income, net of tax 426,187 118,941 (144,573)
Foreign currency translation adjustments, net of tax 33,336 18,110 (24,830)
Net current period other comprehensive income (loss) $ 285,866 $ 399,940 $ (150,314)