Property Dispositions - Results of Operations (Details) - Assets held for sale - USD ($) $ in Thousands		3 Months Ended
	Mar. 13, 2017	Mar. 31, 2018	Mar. 31, 2017
Disposal Group, Including Discontinued Operation, Income Statement Disclosures
Revenues		$ 0	$ 7,006
Operating expenses		0	(3,049)
Interest expense	$ 1,600	0	(1,088)
Equity in losses of equity method investments in real estate		0	(688)
Loss on extinguishment of debt		0	(1,320)
Provision for income taxes		0	(10)
Gain on sale of real estate, net of tax		0	1,634
Income before gain on sale of real estate, net of tax		$ 0	$ 2,485