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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, 2015
USD ($)
entity
Dec. 31, 2014
USD ($)
entity
Dec. 31, 2013
USD ($)
entity
Dec. 31, 2012
entity
Related Party Transactions and Investments in Non-Consolidated Entities        
Sponsored REITs (in entities) | entity 9 10 14 15
Balance Sheet Data (unaudited):        
Real estate, net $ 418,959 $ 451,822    
Other assets 101,734 127,259    
Total liabilities (203,628) (203,239)    
Shareholders' equity 317,065 375,842    
Operating Data (unaudited):        
Rental revenues 57,777 66,457 $ 93,608  
Other revenues 34 43 68  
Operating and maintenance expenses (31,693) (34,318) (48,718)  
Depreciation and amortization (21,149) (23,417) (31,450)  
Interest expense (9,920) (9,627) (13,752)  
Gain on sale, less applicable income tax     5,851  
Net loss $ (4,951) $ (862) $ 5,607