Segment Reporting (Details 2) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Segment Reporting [Abstract]
Rental income from real estate assets sold or held for sale	$ 2,591	$ 30,024	$ 7,193	$ 61,857
Operating expenses from real estate assets sold or held for sale	(1,096)	(10,344)	(3,116)	(21,480)
Net operating income from real estate assets sold or held for sale	$ 1,495	$ 19,680	$ 4,077	$ 40,377