Real Estate Investments and Related Intangibles - Unconsolidated Joint Ventures Narrative (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2018 USD ($) property	Mar. 31, 2017 USD ($) property	Dec. 31, 2017 USD ($) property joint_venture
Schedule of Equity Method Investments [Line Items]
Investment in unconsolidated entities	$ 33,736		$ 39,520
% of Outstanding Shares Owned	90.00%		90.00%
Net (loss) income	$ 364	$ (82)
Underlying equity in net assets	5,000		$ 5,000
Unconsolidated Joint Venture [Member]
Schedule of Equity Method Investments [Line Items]
Investment in unconsolidated entities	33,700		$ 39,500
Net (loss) income	$ 400	$ 300
Unconsolidated Properties [Member]
Schedule of Equity Method Investments [Line Items]
Number of properties owned | property	1	2	1
Number of unconsolidated joint ventures | joint_venture			2
Unconsolidated Property Dispositions, 2018 [Member]
Schedule of Equity Method Investments [Line Items]
Number of disposed properties owned by unconsolidated joint ventures | property	1