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Income Taxes - Summary of Provision for Income Taxes (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Current income tax expense:      
Federal $ 12,671 $ (41,418) $ 154,050
State 5,862 5,875 1,440
Foreign 130,180 64,946 69,359
Current income tax expense 148,713 29,403 224,849
Deferred income tax (benefit) expense:      
Federal (93,842) (5,166) (6,865)
State (891) (2,863) 2,156
Foreign (8,575) (6,059) (16,926)
Deferred income tax (benefit) expense: (103,308) (14,088) (21,635)
Income tax expense $ 45,405 $ 15,315 $ 203,214