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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Statement of Comprehensive Income [Abstract]
Net income	$ 38,537us-gaap_ProfitLoss	$ 19,115us-gaap_ProfitLoss
Other comprehensive (loss) income
Unrealized (loss) on valuation of swap agreements	(4,319)us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax	(2,329)us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax
Reclassification of realized interest on swap agreements	1,053us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax	837us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax
Other comprehensive (loss)	(3,266)us-gaap_OtherComprehensiveIncomeLossNetOfTax	(1,492)us-gaap_OtherComprehensiveIncomeLossNetOfTax
Comprehensive income	35,271us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	17,623us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest
Comprehensive (income) loss attributable to noncontrolling interests	(21,567)us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	2,433us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest
Comprehensive income attributable to Common Shareholders	$ 13,704us-gaap_ComprehensiveIncomeNetOfTax	$ 20,056us-gaap_ComprehensiveIncomeNetOfTax

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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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