Real Estate Disposition Activities (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
Summary of income from discontinued operations
Rental income	$ 0	$ 11,924	$ 579	$ 25,926
Operating and other expenses	0	(3,494)	(269)	(7,480)
Depreciation expense	0	(6,349)	0	(10,619)
Income from discontinued operations	$ 0	$ 2,081	$ 310	$ 7,827