Segment Reporting (Details 2) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Segment Reporting [Abstract]
Rental income from real estate assets sold or held for sale	$ 2,650	$ 13,916
Operating expenses from real estate assets sold or held for sale	(1,263)	(5,310)
Net operating income from real estate assets sold or held for sale	$ 1,387	$ 8,606