Stockholders' Equity - AOCI (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Jun. 30, 2016	Dec. 31, 2015
Accumulated Other Comprehensive Income (Loss) [Line Items]
Stockholders' Equity Attributable to Parent, Beginning Balance			$ 369,774
Net current period other comprehensive (loss) income	$ 1,497	$ (22,554)	(38,425)	$ (9,064)
Stockholders' Equity Attributable to Parent, Ending Balance	406,698		406,698
Income tax benefit	564		2,555
Disproportionate tax effect	14,400		14,400
Deferred taxes provided for basis difference in foreign subsidiaries	0		0
Accumulated Other Comprehensive Loss, Net
Accumulated Other Comprehensive Income (Loss) [Line Items]
Stockholders' Equity Attributable to Parent, Beginning Balance	(128,090)		(88,126)
Other comprehensive (loss) income before reclassification	(5,574)		(60,146)
Amounts reclassified from accumulated other comprehensive loss, net	7,281		21,889
Net current period other comprehensive (loss) income	1,707		(38,257)
Stockholders' Equity Attributable to Parent, Ending Balance	(126,383)		(126,383)
Foreign currency translation adjustments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Stockholders' Equity Attributable to Parent, Beginning Balance	(65,827)		(45,886)
Other comprehensive (loss) income before reclassification	(6,745)		(26,686)
Net current period other comprehensive (loss) income	(6,745)		(26,686)
Stockholders' Equity Attributable to Parent, Ending Balance	(72,572)		(72,572)
Deferred income tax benefit (expense)	4,120		4,120		$ 3,556	$ 1,565
Deferred tax expense (benefit) before reclassification	(564)		(2,555)
Unrealized (losses) gains on interest rate swap contracts
Accumulated Other Comprehensive Income (Loss) [Line Items]
Stockholders' Equity Attributable to Parent, Beginning Balance	(62,263)		(42,240)
Other comprehensive (loss) income before reclassification	1,171		(33,460)
Amounts reclassified from accumulated other comprehensive loss, net	7,281		21,889
Net current period other comprehensive (loss) income	8,452		(11,571)
Stockholders' Equity Attributable to Parent, Ending Balance	(53,811)		(53,811)
Deferred income tax benefit (expense)	6,481		6,481		$ 11,071	$ 2,959
Deferred tax expense (benefit) before reclassification	636		(10,184)
Deferred tax expense (benefit), reclassification from AOCI	$ 3,954		$ 6,662