Real Estate Investments and Related Intangibles - Unconsolidated Joint Ventures Narrative (Details) $ in Thousands	3 Months Ended
Mar. 31, 2019 USD ($) property	Mar. 31, 2018 USD ($) property	Dec. 31, 2018 USD ($) property
Schedule of Equity Method Investments [Line Items]
Number of properties owned \| property	3,980
Investment in unconsolidated entities	$ 35,790		$ 35,289
% of Outstanding Shares Owned	90.00%		90.00%
Net (loss) income	$ 500	$ 364
Underlying equity in net assets	3,400		$ 4,700
Unconsolidated Joint Venture [Member]
Schedule of Equity Method Investments [Line Items]
Investment in unconsolidated entities	35,800		$ 35,300
Net (loss) income	$ 500	$ 400
Unconsolidated Properties [Member]
Schedule of Equity Method Investments [Line Items]
Number of properties owned \| property	1		1
Unconsolidated Property Dispositions, 2018 [Member]
Schedule of Equity Method Investments [Line Items]
Number of disposed properties owned by unconsolidated joint ventures \| property		1

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized.

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The number of real estate properties owned as of the balance sheet date.

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Number of Unconsolidated Joint Ventures Disposed of

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