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Related Party Transactions and Investments in Non-Consolidated Entities - Summarized financial information for Sponsored REITs (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2019 USD ($) entity	Mar. 31, 2018 USD ($) entity	Dec. 31, 2018 USD ($) entity
Related Party Transactions and Investments in Non-Consolidated Entities
Number of REITs in which are included in the operations data | entity	3	6
Number of Sponsored REITs the Company held an interest in at period end | entity	3		3
Balance Sheet Data (unaudited):
Real estate, net	$ 95,623		$ 97,034
Other assets	19,003		18,532
Total liabilities	(76,258)		(75,382)
Shareholders' equity	38,368		$ 40,184
Operating Data (unaudited):
Rental revenues	3,429	$ 13,229
Other revenues		1
Operating and maintenance expenses	(1,795)	(6,892)
Depreciation and amortization	(1,329)	(4,369)
Interest expense	(1,287)	(2,006)
Net income (loss)	$ (982)	$ (37)

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The amount of depreciation and amortization reported by an equity method investment of the entity.

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