Segment Reporting (Details 2) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Segment Reporting [Abstract]
Rental income from real estate assets sold or held for sale	$ 1,664	$ 15,277	$ 6,376	$ 31,188
Operating expenses from real estate assets sold or held for sale	(626)	(5,932)	(2,476)	(11,867)
Net operating income from real estate assets sold or held for sale	$ 1,038	$ 9,345	$ 3,900	$ 19,321