Dispositions and Impairment - Schedule of Properties Held for Sale (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Liabilities:
Liabilities held for sale	$ 465	$ 386
Disposal Group, Held-for-sale, Not Discontinued Operations [Member]
Assets:
Real estate, at cost	39,680	63,639
Real estate, intangible assets	7,202	14,498
Accumulated depreciation and amortization	(21,590)	(16,873)
Rent receivable - deferred	742	2,439
Other	282	165
Assets held for sale	26,316	63,868
Liabilities:
Accounts payable and other liabilities	239	42
Prepaid rent	226	344
Liabilities held for sale	$ 465	$ 386

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