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Other Comprehensive Income (Loss) - Components of other comprehensive income (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Before tax amount:        
Unrealized holding gains (losses) arising during period, before tax $ 555,576 $ 248,074 $ 492,125 $ 503,064
Less reclassification of net realized gains included in net income, before tax 185,554 59,760 321,933 70,160
Foreign currency translation adjustments, before tax 22,595 4,409 (22,829) 10,053
Other comprehensive income (loss), before tax 392,617 192,723 147,363 442,957
Tax expense (benefit):        
Unrealized holding gains (losses) arising during period, tax 62,780 25,601 56,616 54,704
Less reclassification of net realized gains included in net income, tax 18,163 4,415 33,313 4,594
Foreign currency translation adjustments, tax 344 142 (391) 270
Other comprehensive income (loss), tax 44,961 21,328 22,912 50,380
Net of tax amount:        
Unrealized holding gains (losses) arising during period, net of tax 492,796 222,473 435,509 448,360
Less reclassification of net realized gains included in net income, net of tax 167,391 55,345 288,620 65,566
Foreign currency translation adjustments, net of tax 22,251 4,267 (22,438) 9,783
Net current period other comprehensive income (loss) $ 347,656 $ 171,395 $ 124,451 $ 392,577