Property Dispositions and Discontinued Operations - Additional Information (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2015 USD ($) Property	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Debt satisfaction gains (charges), net	$ 0	$ (312)	$ 8,905
Aggregate net disposition price	156,461	226,375	75,519
Aggregate gain on sale of properties	$ 24,884	$ 57,507	$ 24,472
Properties classified as held-for-sale (in number of properties) | Property	2
Debt Satisfaction Gains (Charges), Net [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Debt satisfaction gains (charges), net	$ 21,504