Discontinued Operations (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Operating expenses:
Income from discontinued operations	$ 0	$ 0	$ 0	$ 4,097
Net gains on disposition of discontinued operations	0	0	0	414,496
Total income from discontinued operations	0	0	0	418,593
Disposal Group, Discontinued Operations [Member]
Discontinued Operations [Abstract]
Rental and other revenues	0	0	0	8,484
Operating expenses:
Rental property and other expenses	0	0	0	3,334
General and administrative	0	0	0	1,388
Total operating expenses	0	0	0	4,722
Interest expense	0	0	0	85
Other income	0	0	0	420
Income from discontinued operations	0	0	0	4,097
Net gains on disposition of discontinued operations	0	0	0	414,496
Total income from discontinued operations	$ 0	$ 0	0	418,593
Net Cash Provided by/(Used in) Discontinued Operations [Abstract]
Cash flows from operating activities			0	2,040
Cash flows from investing activities			$ 0	$ 417,097