Segment Reporting (Details 2) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Segment Reporting [Abstract]
Rental income from real estate assets sold or held for sale, not classified as discontinued operations	$ 2,238	$ 5,871	$ 13,809	$ 15,659
Operating expenses real estate assets sold or held for sale, not classified as discontinued operations	(1,022)	(2,336)	(5,436)	(6,072)
Income (Loss) From Assets Held for Sale, Not Classified as Discontinued Operations	$ 1,216	$ 3,535	$ 8,373	$ 9,587