Consolidated Statements Of Comprehensive Income (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Consolidated Statements Of Comprehensive Income [Abstract]
Net income (loss)	$ 35,194us-gaap_ProfitLoss	$ 20,647us-gaap_ProfitLoss	$ 43,262us-gaap_ProfitLoss
Unrealized gains (losses) on interest rate swap contracts, net of income tax expense (benefit) of $4,128, $16,584, and $(14,811) for the years ended December 31, 2014, 2013, and 2012, respectively	6,220	25,933	(23,684)
Foreign currency translation adjustments	(16,273)	6,198	2,501
Other comprehensive (loss) income	(10,053)	32,131	(21,183)
Total comprehensive income (loss)	25,141	52,778	22,079
Less: comprehensive loss attributable to noncontrolling interests	(1,987)	(3,134)	(220)
Comprehensive income (loss) attributable to controlling interests	$ 27,128us-gaap_ComprehensiveIncomeNetOfTax	$ 55,912us-gaap_ComprehensiveIncomeNetOfTax	$ 22,299us-gaap_ComprehensiveIncomeNetOfTax

Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.

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Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income (loss) and other comprehensive income (loss), attributable to noncontrolling interests. Excludes changes in equity resulting from investments by owners and distributions to owners.

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Amount after tax and reclassification adjustments, of increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss).

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Amount after tax and reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature.

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