Accumulated Other Comprehensive (Loss) Income Amount of Income Tax (Expense) Benefit Allocated to Component of Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Equity [Abstract]
Foreign currency translation, Other comprehensive income (loss), before tax	$ (150,262)	$ 228,508	$ (20,849)
Foreign currency translation, Income tax (expense) benefit	4	(1,069)	24
Foreign currency translation, Other comprehensive income (loss), net of tax	(150,258)	227,439	(20,825)
Pension and other postretirement benefits, Other comprehensive (loss) income, before tax	(128)	(96)	839
Pension and other postretirement benefits, Income tax expense	(10)	(1)	(5)
Pension and other postretirement benefits, Other comprehensive (loss) income, net of tax	(138)	(97)	834
Net investment hedge, Other comprehensive (loss) income, before tax	20,424	(65,958)	41,209
Net investment hedge, Income tax benefit (expense)	5,362	24,131	(15,076)
Net investment hedge, Other comprehensive (loss) income, net of tax	25,786	(41,827)	26,133
Interest rate swap, Other comprehensive income, before tax	3,336	3,336	3,336
Interest rate swap, Income tax expense	(3,921)	(1,220)	(1,220)
Interest rate swap, Other comprehensive income, net of tax	$ (585)	$ 2,116	$ 2,116