Segment Reporting (Details 2) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Segment Reporting [Abstract]
Rental income from real estate assets sold or held for sale, not classified as discontinued operations	$ 2,285	$ 10,226	$ 4,809	$ 20,595
Operating expenses from real estate assets sold or held for sale, not classified as discontinued operations	(932)	(3,986)	(2,018)	(8,073)
Income (Loss) From Assets Held for Sale, Not Classified as Discontinued Operations	$ 1,353	$ 6,240	$ 2,791	$ 12,522