Investment in Real Estate - Real Estate Held-for-sale (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Assets associated with real estate held for sale	$ 0	$ 411,931
Liabilities associated with real estate held for sale	0	4,903
Disposal Group, Held-for-sale, Not Discontinued Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Investment in real estate, net	0	396,846
Accounts receivable, net	0	213
Straight-line rent receivables, net	0	5,225
Deferred leasing costs and lease intangible assets, net	0	9,589
Prepaid expenses and other assets, net	0	58
Assets associated with real estate held for sale	0	411,931
Accounts payable and accrued liabilities	0	1,808
Lease intangible liabilities, net	0	485
Security deposits and prepaid rent	0	2,610
Liabilities associated with real estate held for sale	$ 0	$ 4,903

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