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Related Party Transactions and Investments in Non-Consolidated Entities - Summarized financial information for Sponsored REITs (Details)
$ in Thousands
 9 Months Ended
Sep. 30, 2019
USD ($)
entity
Sep. 30, 2018
USD ($)
entity
Dec. 31, 2018
USD ($)
entity
Related Party Transactions and Investments in Non-Consolidated Entities      
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 $ 44,440   $ 97,034
Other assets 9,709   18,532
Total liabilities (22,954)   (75,382)
Shareholders' equity 31,195   $ 40,184
Operating Data (unaudited):      
Rental revenues 7,819 $ 35,714  
Other revenues   1  
Operating and maintenance expenses (4,276) (18,479)  
Depreciation and amortization (2,971) (11,451)  
Interest expense (2,939) (5,692)  
Gain (loss) on sale 26,195 17,095  
Net income (loss) $ 23,828 $ 17,188