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Related Party Transactions and Investments in Non-Consolidated Entities - Summarized financial information for Sponsored REITs (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2018 USD ($) entity	Dec. 31, 2017 USD ($) entity	Dec. 31, 2016 USD ($) entity
Related Party Transactions and Investments in Non-Consolidated Entities
Number of REITs in which are included in the operations data | entity	6	7	9
Number of Sponsored REITs the Company held an interest in at period end | entity	3	6	7
Balance Sheet Data (unaudited):
Real estate, net	$ 97,034	$ 312,861
Other assets	18,532	74,076
Total liabilities	(75,382)	(151,092)
Shareholders' equity	40,184	235,845
Operating Data (unaudited):
Rental revenues	40,382	53,249	$ 54,257
Other revenues	1	7	39
Operating and maintenance expenses	(20,584)	(27,495)	(29,186)
Depreciation and amortization	(13,077)	(18,395)	(18,274)
Interest expense	(6,869)	(8,281)	(8,481)
Gain (loss) on sale	17,095	(702)	26,397
Net income (loss)	$ 16,948	$ (1,617)	$ 24,752

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