Segment Reporting Segment Reporting (Details 2) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Segment Reporting [Abstract]
Rental income from real estate assets sold or held for sale	$ 21,441	$ 124,373	$ 170,172
Operating expenses from real estate assets sold or held for sale	(9,123)	(45,001)	(64,509)
Net operating income from real estate assets sold or held for sale	$ 12,318	$ 79,372	$ 105,663