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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, 2018
USD ($)
entity
Mar. 31, 2017
USD ($)
entity
Dec. 31, 2017
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  
Number of Sponsored REITs the Company held an interest in at period end | entity 6   6
Balance Sheet Data (unaudited):      
Real estate, net $ 311,178   $ 312,861
Other assets 70,909   74,076
Total liabilities (148,088)   (151,092)
Shareholders' equity 233,999   $ 235,845
Operating Data (unaudited):      
Rental revenues 13,229 $ 13,875  
Other revenues 1 2  
Operating and maintenance expenses (6,892) (7,176)  
Depreciation and amortization (4,369) (5,316)  
Interest expense (2,006) (2,119)  
Net loss $ (37) $ (734)