Real Estate Investments and Related Intangibles - Unconsolidated Joint Ventures Narrative (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2018 USD ($) property	Dec. 31, 2017 USD ($) joint_venture property	Dec. 31, 2016 USD ($)
Schedule of Equity Method Investments [Line Items]
Investment in unconsolidated entities	$ 35,289	$ 39,520
% of Outstanding Shares Owned	90.00%	90.00%
Net (loss) income	$ 1,869	$ 2,726	$ (415)
Underlying equity in net assets	4,700	8,600
Unconsolidated Joint Venture [Member]
Schedule of Equity Method Investments [Line Items]
Investment in unconsolidated entities	35,300	39,500
Net (loss) income	$ 1,200	$ 3,300	$ 900
Unconsolidated Properties [Member]
Schedule of Equity Method Investments [Line Items]
Number of properties owned | property	1	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