Segment Reporting (Details 2) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Segment Reporting [Abstract]
Rental income from real estate assets sold or held for sale, not classified as discontinued operations	$ 3,400	$ 3,574	$ 7,012	$ 6,813
Operating expenses real estate assets sold or held for sale, not classified as discontinued operations	(1,370)	(1,266)	(2,698)	(2,635)
Income (Loss) From Assets Held for Sale, Not Classified as Discontinued Operations	$ 2,030	$ 2,308	$ 4,314	$ 4,178