Segment Reporting (Details 2) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Segment Reporting [Abstract]
Rental income from real estate assets sold or held for sale	$ 2,394	$ 29,647
Operating expenses from real estate assets sold or held for sale	(1,156)	(10,336)
Net operating income from real estate assets sold or held for sale	$ 1,238	$ 19,311