Real Estate Disposition Activities (Details 2) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Summary of income from discontinued operations
Rental income	$ 0	$ 579	$ 42,874
Operating and other expenses	0	(269)	(12,661)
Interest expense, net	0	0	0
Loss on extinguishment of debt	0	0	0
Depreciation expense	0	0	(13,500)
Income (loss) from discontinued operations	$ 0	$ 310	$ 16,713