Segment Reporting (Details 2) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Segment Reporting [Abstract]
Rental income from real estate assets sold or held for sale	$ 3,044	$ 16,388	$ 15,582	$ 53,582
Operating expenses from real estate assets sold or held for sale	(1,170)	(6,349)	(5,949)	(20,407)
Net operating income from real estate assets sold or held for sale	$ 1,874	$ 10,039	$ 9,633	$ 33,175