Accumulated Other Comprehensive Loss, Net (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2017	Jun. 30, 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	$ 359,256	359,256
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	(68,275)	(107,135)
Other comprehensive income (loss) before reclassification	18,459	47,176
Amounts reclassified from accumulated other comprehensive loss, net	4,602	14,745
Net current period other comprehensive (loss) income	23,061	61,921
Shareholders' Equity Attributable to Parent, Ending Balance	(45,214)	(45,214)
Foreign currency translation adjustments [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Shareholders' Equity Attributable to Parent, Beginning Balance	(48,331)	(81,602)
Other comprehensive income (loss) before reclassification	17,871	51,142
Net current period other comprehensive (loss) income	17,871	51,142
Shareholders' Equity Attributable to Parent, Ending Balance	(30,460)	(30,460)
Deferred income tax expense (benefit)	(5,369)	(5,369)	$ (5,424)	$ (4,113)
Deferred tax expense (benefit) before reclassification	55	1,256
Unrealized losses on interest rate swap contracts [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Shareholders' Equity Attributable to Parent, Beginning Balance	(19,944)	(25,533)
Other comprehensive income (loss) before reclassification	588	(3,966)
Amounts reclassified from accumulated other comprehensive loss, net	4,602	14,745
Net current period other comprehensive (loss) income	5,190	10,779
Shareholders' Equity Attributable to Parent, Ending Balance	(14,754)	(14,754)
Deferred income tax expense (benefit)	12,908	12,908	$ 11,164	$ 9,269
Deferred tax expense (benefit) before reclassification	198	(1,339)
Deferred tax expense (benefit), reclassification from AOCI	$ 1,546	$ 4,978