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Transactions with Affiliates - Summary of Amounts Due to Manager or its Affiliates (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Related Party Transaction [Line Items]    
Due from affiliates $ 45,779 $ 51,518
Due to Affiliates 0 23,534
Fee income    
Related Party Transaction [Line Items]    
Due from affiliates 34,429 19,366
Cost reimbursements and recoverable expenses    
Related Party Transaction [Line Items]    
Due from affiliates 10,754 30,749
Employees and other affiliates    
Related Party Transaction [Line Items]    
Due from affiliates 596 1,403
Investment vehicles and unconsolidated ventures    
Related Party Transaction [Line Items]    
Due to Affiliates 0 2,884
Employees    
Related Party Transaction [Line Items]    
Due to Affiliates   20,650
Senior Management | Employees    
Related Party Transaction [Line Items]    
Due to Affiliates $ 0 $ 20,650