Accumulated Other Comprehensive (Loss) Income Amount of Income Tax (Expense) Benefit Allocated to Component of Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Equity [Abstract]
Foreign Currency Translation, Other comprehensive income (loss), before tax	$ 64,069	$ (50,738)	$ 144,210	$ 48,539
Foreign Currency Translation, Income tax (expense) benefit	0	(455)	(1,086)	(826)
Foreign Currency Translation, Other comprehensive income (loss), net of tax	64,069	(51,193)	143,124	47,713
Pension and Postretirement Benefits, Other comprehensive income (loss), before tax	16	422	10	426
Pension and Postretirement Benefits, Income tax (expense) benefit	0	(3)	(1)	(6)
Pension and Postretirement Benefits, Other comprehensive income (loss), net of tax	16	419	9	420
Net investment hedge, Other comprehensive income (loss), before tax	(22,446)	10,490	(44,026)	(4,631)
Net investment hedge, Income tax (expense) benefit	8,212	(3,883)	16,107	1,714
Net investment hedge, Other comprehensive income (loss), net of tax	(14,234)	6,607	(27,919)	(2,917)
Interest rate swap, Other comprehensive income (loss), before tax	834	834	1,668	1,668
Interest rate swap, Income tax benefit (expense) benefit	(305)	(308)	(610)	(617)
Interest rate swap, Other comprehensive income (loss), net of tax	$ 529	$ 526	$ 1,058	$ 1,051