Real Estate Disposition Activities (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
Summary of income from discontinued operations
Rental income	$ 0	$ 11,114	$ 579	$ 37,040
Operating and other expenses	0	(3,516)	(269)	(10,996)
Depreciation expense	0	(2,535)	0	(13,154)
Income from discontinued operations	$ 0	$ 5,063	$ 310	$ 12,890