Income Taxes - Schedule of Significant Components of Adjustment to Tax Expense (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Remeasurement of U.S. deferred tax assets and liabilities, Provisional amount	$ 2,913
Transition tax on foreign earnings, Provisional amount	104,327
Foreign tax credits used to offset transition tax, Provisional amount	(58,975)
Other adjustments, Provisional amount	(2,357)
Total net tax expense related to the Tax Act, Provisional amount	45,908
Remeasurement of U.S. deferred tax assets and liabilities, Final amount	3,112
Transition tax on foreign earnings, Final amount	101,512
Foreign tax credits used to offset transition tax, Final amount	(54,350)
Other adjustments, Final amount	(1,604)
Total net tax expense related to the Tax Act, Final amount	48,670
Remeasurement of U.S. deferred tax assets and liabilities, Adjustment	199
Transition tax on foreign earnings, Adjustment	(2,815)
Foreign tax credits used to offset transition tax, Adjustment	4,625
Other adjustments, Adjustment	753	$ 800
Total net tax expense related to the Tax Act, Adjustment	$ 2,762