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Related Party Transactions and Investments in Non-Consolidated Entities - Summarized financial information for Sponsored REITs (Details)
$ in Thousands
 6 Months Ended
Jun. 30, 2019
USD ($)
entity
Jun. 30, 2018
USD ($)
entity
Dec. 31, 2018
USD ($)
entity
Sponsored REITs      
Number of REITs in which the entity holds non-controlling common stock interest | entity 2   3
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 2    
Balance Sheet Data (unaudited):      
Real estate, net $ 44,781   $ 97,034
Other assets 9,850   18,532
Total liabilities (22,775)   (75,382)
Shareholders' equity 31,856   $ 40,184
Operating Data (unaudited):      
Rental revenues 7,152 $ 25,755  
Other revenues   1  
Operating and maintenance expenses (3,561) (13,175)  
Depreciation and amortization (2,664) (8,606)  
Interest expense (2,538) (4,030)  
Gain (loss) on sale   9,393  
Net income (loss) $ (1,611) $ 9,338