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Income Taxes - Provision for Income Taxes (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Income Tax Disclosure [Abstract]                      
Current federal tax expense (benefit)                 $ 50,691 $ 53,084 $ 47,980
Current foreign tax expense (benefit)                 36,028 28,613 23,102
Current state and local tax expense (benefit)                 2,681 1,356 2,783
Current income tax expense (benefit)                 89,400 83,053 73,865
Deferred federal income tax expense (benefit)                 17,399 (46,622) 50,758
Deferred foreign income tax expense (benefit)                 (14,809) (7,166) (4,710)
Deferred state and local income tax expense (benefit)                     (1,732)
Deferred income tax expense (benefit)                 2,590 (53,788) 44,316
Federal income tax expense (benefit)                 68,090 6,462 98,738
Foreign income tax expense (benefit)                 21,219 21,447 18,392
State and local income tax expense (benefit)                 2,681 1,356 1,051
Income tax expense (benefit) $ 21,381 $ 26,296 $ 27,065 $ 17,248 $ (60,354) $ 33,565 $ 33,282 $ 22,772 $ 91,990 $ 29,265 $ 118,181