Accumulated Other Comprehensive Loss, Net (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Dec. 31, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]
Shareholders' Equity Attributable to Parent, Beginning Balance	$ 390,472
Shareholders' Equity Attributable to Parent, Ending Balance	418,680
Disproportionate tax effect	14,600
Deferred taxes provided for basis difference in foreign subsidiaries	0
Accumulated Other Comprehensive Loss, Net
Accumulated Other Comprehensive Income (Loss) [Line Items]
Shareholders' Equity Attributable to Parent, Beginning Balance	(33,595)
Other comprehensive income (loss) before reclassification	22,396
Amounts reclassified from accumulated other comprehensive loss, net	2,589
Net current period other comprehensive (loss) income	24,985
Shareholders' Equity Attributable to Parent, Ending Balance	(8,610)
Foreign currency translation adjustments [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Shareholders' Equity Attributable to Parent, Beginning Balance	(24,374)
Other comprehensive income (loss) before reclassification	7,624
Net current period other comprehensive (loss) income	7,624
Shareholders' Equity Attributable to Parent, Ending Balance	(16,750)
Deferred income tax expense (benefit)	(5,315)	$ (5,339)
Deferred tax expense before reclassification	24
Unrealized (losses) gains on interest rate swap and foreign currency forward contracts
Accumulated Other Comprehensive Income (Loss) [Line Items]
Shareholders' Equity Attributable to Parent, Beginning Balance	(9,221)
Other comprehensive income (loss) before reclassification	14,772
Amounts reclassified from accumulated other comprehensive loss, net	2,589
Net current period other comprehensive (loss) income	17,361
Shareholders' Equity Attributable to Parent, Ending Balance	8,140
Deferred income tax expense (benefit)	21,460	$ 16,317
Deferred tax expense before reclassification	4,376
Deferred tax expense, reclassification from AOCI	$ 767