Selected Quarterly Financial Data (unaudited) - Additional information (Details) $ in Thousands	3 Months Ended					12 Months Ended
	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Sep. 30, 2015 USD ($) property	Jun. 30, 2015 USD ($) property	Mar. 31, 2015 USD ($)	Dec. 31, 2016 USD ($) property	Dec. 31, 2015 USD ($) property	Dec. 31, 2014 USD ($)
Quarterly Financial Information Disclosure [Abstract]
Impairment charges		$ 700			$ 3,300
Gain on sales of real estate assets	$ 41,000	$ 9,100	$ 10,600	$ 41,500		$ 41,038	$ 56,602	$ 0
Number of properties sold | property			1	2		6	2
Loss on extinguishment of debt				$ (28,000)		$ 0	$ 27,998	$ 0