Accumulated Other Comprehensive Loss, Net (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]
Shareholders' Equity Attributable to Parent, Beginning Balance		$ 457,015
Shareholders' Equity Attributable to Parent, Ending Balance	$ 508,147	508,147
Disproportionate tax effect	14,700	14,700
Deferred taxes provided for basis difference in foreign subsidiaries	0	0
Accumulated Other Comprehensive Loss, Net [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Shareholders' Equity Attributable to Parent, Beginning Balance	(98,484)	(107,135)
Other comprehensive income (loss) before reclassification	25,326	28,717
Amounts reclassified from accumulated other comprehensive loss, net	4,883	10,143
Net current period other comprehensive (loss) income	30,209	38,860
Shareholders' Equity Attributable to Parent, Ending Balance	(68,275)	(68,275)
Foreign currency translation adjustments [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Shareholders' Equity Attributable to Parent, Beginning Balance	(74,356)	(81,602)
Other comprehensive income (loss) before reclassification	26,025	33,271
Net current period other comprehensive (loss) income	26,025	33,271
Shareholders' Equity Attributable to Parent, Ending Balance	(48,331)	(48,331)
Deferred income tax expense (benefit)	(5,424)	(5,424)	$ (5,496)	$ (4,113)
Deferred tax expense (benefit) before reclassification	72	(1,311)
Unrealized losses on interest rate swap contracts [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Shareholders' Equity Attributable to Parent, Beginning Balance	(24,128)	(25,533)
Other comprehensive income (loss) before reclassification	(699)	(4,554)
Amounts reclassified from accumulated other comprehensive loss, net	4,883	10,143
Net current period other comprehensive (loss) income	4,184	5,589
Shareholders' Equity Attributable to Parent, Ending Balance	(19,944)	(19,944)
Deferred income tax expense (benefit)	11,164	11,164	$ 10,629	$ 9,269
Deferred tax expense (benefit) before reclassification	(89)	(1,544)
Deferred tax expense (benefit), reclassification from AOCI	$ 624	$ 3,439