Dispositions (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Dispositions [Abstract]
Real Estate, Net	$ 2,642		$ 2,642		$ 29,561
Other Assets	2,904		2,904		7,459
Assets related to discontinued operations	5,546		5,546		37,020
Liabilities related to discontinued operations	3,284		3,284		$ 12,470
Income from discontinued operations:
Total revenues	676	$ 2,589	2,805	$ 24,868
Total expenses	106	1,279	1,254	16,672
Income from discontinued operations before gain on sale of real estate and a lease position	570	1,310	1,551	8,196
Net gains on sale of real estate and a lease position	2,864	33,153	5,074	65,396
Impairment losses	(465)	0	(465)	(256)
UE spin-off transaction related costs	0	0	0	(22,972)
Pretax income from discontinued operations	2,969	34,463	6,160	50,364
Income tax expense	0	0	0	(86)
Income from discontinued operations	$ 2,969	$ 34,463	6,160	50,278
Cash flows related to discontinued Operations:
Cash flows from operating activities			850	(34,490)
Cash flows from investing activities			$ 2,785	$ 348,697