Consolidated Statements Of Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Consolidated Statements Of Comprehensive Income (Loss) [Abstract]
Net (loss) income	$ (894)	$ 15,359
Unrealized gain (loss) on interest rate swap contracts, net of deferred income tax expense (benefit) of $1,360 and $(5,890) for the three months ended March 31, 2017 and 2016, respectively	1,405	(10,686)
Foreign currency translation adjustments, net of deferred income tax (benefit) of $(1,383) and $(825) for the three months ended March 31, 2017 and 2016, respectively	7,246	(5,271)
Other comprehensive income (loss)	8,651	(15,957)
Total comprehensive income (loss)	7,757	(598)
Less: comprehensive income attributable to noncontrolling interests	6	95
Comprehensive income (loss) attributable to controlling interests	$ 7,751	$ (693)