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Income Taxes - Components of income tax (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Current expense (benefit):      
United States $ 181,571 $ 139,407 $ 73,078
Non-U.S. 16,091 4,954 12,785
Current Income Tax Expense (Benefit) 197,662 144,361 85,863
Deferred expense (benefit):      
United States (89,170) 11,849 19,544
Non-U.S. 3,346 (400) 8,544
Deferred Income Tax Expense (Benefit) (85,824) 11,449 28,088
Income tax expense (benefit) $ 111,838 $ 155,810 $ 113,951