Investment in Unconsolidated Joint Ventures - Income Statement of Unconsolidated Joint Ventures (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Schedule of Equity Method Investments [Line Items]
Operating expenses	$ (92,546)	$ (107,407)
Depreciation and amortization	(41,940)	(49,136)
Operating income	18,518	12,277
Interest expense	(16,915)	(19,198)
Loan cost amortization	(768)	(705)
Equity Method Investee
Schedule of Equity Method Investments [Line Items]
Revenues	3,623	2,967
Operating expenses	(1,388)	(1,035)
Depreciation and amortization	(1,541)	(2,151)
Operating income	694	(219)
Interest expense	(848)	(249)
Loan cost amortization	(25)	(43)
Net loss	$ (179)	$ (511)