Dispositions and Impairment - Schedule of Properties Held for Sale (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Liabilities:
Liabilities held for sale	$ 2,333	$ 0
Disposal Group, Held-for-sale, Not Discontinued Operations [Member]
Assets:
Real estate, at cost	167,733	2,827
Real estate, intangible assets	23,369	0
Accumulated depreciation and amortization	(26,368)	0
Rent receivable - deferred	4,235	0
Other	2,581	0
Assets held for sale	171,550	2,827
Liabilities:
Mortgages and notes payable, net	104	0
Accounts payable and other liabilities	1,912	0
Prepaid rent	317	0
Liabilities held for sale	$ 2,333	$ 0