Consolidated Statements Of Comprehensive (Loss) Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Consolidated Statements Of Comprehensive (Loss) Income
Net (loss) income	$ (145,351)	$ 87,910	$ 65,981
Unrealized gain on interest rate swap and foreign currency forward contracts, net of deferred income tax expense of $7,050, $12,228, and $3,742 for the years ended December 31, 2017, 2016, and 2015, respectively.	17,029	15,990	6,058
Foreign currency translation adjustments, net of deferred income tax (benefit) of ($1,226), $(2,548), and $(1,565) for the years ended December 31, 2017, 2016, and 2015 respectively.	56,511	(34,999)	(11,177)
Other comprehensive income (loss)	73,540	(19,009)	(5,119)
Total comprehensive (loss) income	(71,811)	68,901	60,862
Less: comprehensive income (loss) attributable to noncontrolling interests		(99)	(438)
Comprehensive (loss) income attributable to controlling interests	$ (71,811)	$ 69,000	$ 61,300