Property Dispositions and Real Estate Impairment - Schedule of Assets and Liabilities Held for Sale (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Assets:
Real estate, at cost	$ 8,607	$ 25,957
Real estate, intangible assets	0	7,789
Accumulated depreciation and amortization	0	(13,346)
Rent receivable - current	11	0
Rent receivable - deferred	0	1,715
Other assets	20	1,693
Assets held for sale	8,638	23,808
Liabilities:
Other	442	191
Liabilities held for sale	$ 442	$ 191