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Real Estate - Properties Held for Sale - Additional Information (Details)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2017
USD ($)
Sep. 30, 2018
USD ($)
Sep. 30, 2017
USD ($)
Dec. 31, 2017
USD ($)
property
Long Lived Assets Held-for-sale [Line Items]        
Impairment charge $ 3,840   $ 3,840  
Fund II        
Long Lived Assets Held-for-sale [Line Items]        
Number of properties held-for-sale | property       1
Properties held-for-sale       $ 25,400
Date Sold   Apr. 17, 2018    
Disposal group, held-for-sale        
Long Lived Assets Held-for-sale [Line Items]        
Properties held for sale net loss   $ 500 $ 600  
Impairment charge       10,600
Disposal group, held-for-sale | Noncontrolling Interests        
Long Lived Assets Held-for-sale [Line Items]        
Impairment charge       $ 7,600