Dispositions (Asseets and liabilities related to dispositions) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Dispositions
Real Estate, Net	$ 1,927		$ 1,927		$ 2,642
Other Assets	2,451		2,451		2,928
Assets related to discontinued operations	4,378		4,378		5,570
Liabilities related to discontinued operations	2,406		2,406		$ 2,870
Income from discontinued operations:
Total revenues	848	$ 947	1,172	$ 2,129
Total expenses	185	682	348	1,148
Income from discontinued operations before net gain on sale of real estate	663	265	824	981
Net gains on the sale of real estate	0	2,210	2,267	2,210
Pretax income from discontinued operations	663	2,475	3,091	3,191
Income tax expense	0	0	0	0
Income from discontinued operations	$ 663	$ 2,475	3,091	3,191
Cash flows related to discontinued Operations:
Cash flows from operating activities, discontinued operations			400	(4,685)
Cash flows from investing activities, discontinued operations			$ 3,419	$ 0