Dispositions, Assets Held for Sale and Discontinued Operations (Details 1) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Revenues:
Rental income	$ 0	$ 881	$ 18,377
Expenses:
Interest expense	0	157	4,246
Property operating expenses	0	0	3,396
Provision for depreciation	0	0	8,160
Income (loss) from discontinued operations, net	$ 0	$ 724	$ 2,575