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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, 2016
USD ($)
entity
Dec. 31, 2015
USD ($)
entity
Dec. 31, 2014
USD ($)
entity
Related Party Transactions and Investments in Non-Consolidated Entities      
Number of REITs in which are included in the operations data | entity 9 10 14
Number of Sponsored REITs the Company held an interest in at period end | entity 7 9 10
Balance Sheet Data (unaudited):      
Real estate, net $ 345,532 $ 418,959  
Other assets 86,594 101,734  
Total liabilities (164,820) (203,628)  
Shareholders' equity 267,306 317,065  
Operating Data (unaudited):      
Rental revenues 54,257 57,777 $ 66,457
Other revenues 39 34 43
Operating and maintenance expenses (29,186) (31,693) (34,318)
Depreciation and amortization (18,274) (21,149) (23,417)
Interest expense (8,481) (9,920) (9,627)
Gain on sale, less applicable income tax 26,397    
Net income (loss) $ 24,752 $ (4,951) $ (862)