Consolidated Statements Of Comprehensive Income (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Consolidated Statements Of Comprehensive Income [Abstract]
Net income	$ 20,647	$ 43,262	$ 70,146
Unrealized gains (losses) on interest rate swap contracts, net of income tax expense (benefit) of $16,584, $(14,811) and $(11,219) for the years ended December 31, 2013, 2012, and 2011, respectively	25,933	(23,684)	(18,283)
Foreign currency translation adjustments	6,198	2,501	(566)
Other comprehensive income (loss)	32,131	(21,183)	(18,849)
Total comprehensive income	52,778	22,079	51,297
Less: comprehensive loss attributable to noncontrolling interests	(3,134)	(220)	(306)
Comprehensive income attributable to controlling interests	$ 55,912	$ 22,299	$ 51,603