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Related Party Transactions (Details)
3 Months Ended 6 Months Ended
Jun. 30, 2018
USD ($)
Jun. 30, 2017
USD ($)
Jun. 30, 2018
USD ($)
Jun. 30, 2017
USD ($)
Jun. 30, 2018
GBP (£)
May 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Sep. 30, 2017
USD ($)
Sep. 30, 2014
Related Party Transaction [Line Items]                  
Related party expenses $ 9,013,000 $ 7,742,000 $ 17,105,000 $ 15,175,000          
Base management fees incurred but not yet paid 9,013,000   $ 9,013,000       $ 8,168,000    
Limited Liability Company [Member]                  
Related Party Transaction [Line Items]                  
Rate of management fees     1.50%            
Extension period     1 year            
Voting requirement to termination management agreement, percentage     66.66%            
Period of termination     180 days            
Termination vote threshold rate, percentage     300.00%            
Termination fee calculation period     24 months            
Limited Liability Company [Member] | Management Fees [Member]                  
Related Party Transaction [Line Items]                  
Related party expenses 9,000,000 7,700,000 $ 17,100,000 15,200,000          
Base management fees incurred but not yet paid 9,000,000   9,000,000       $ 8,200,000    
Limited Liability Company [Member] | Reimbursements [Member]                  
Related Party Transaction [Line Items]                  
Related party expenses 600,000 100,000 1,200,000 200,000          
Champ Limited Partnership [Member] | Subsidiaries [Member]                  
Related Party Transaction [Line Items]                  
Indirect ownership interest from limited partnership                 59.00%
KBC Bank Deutschland AG [Member] | Champ LP [Member]                  
Related Party Transaction [Line Items]                  
Indirect ownership interest from limited partnership                 35.00%
Residential Condominium [Member] | Pre-development Mezzanine Loan [Member] | Affiliated Entity [Member]                  
Related Party Transaction [Line Items]                  
Original face amount               $ 300,000,000.0  
Commercial Mortgage Portfolio Segment [Member] | Affiliated Entity [Member]                  
Related Party Transaction [Line Items]                  
Original face amount   100,000,000.0   100,000,000.0       125,000,000.0  
Commercial Mortgage Portfolio Segment [Member] | Residential Condominium [Member] | Pre-development Mezzanine Loan [Member] | Affiliated Entity [Member]                  
Related Party Transaction [Line Items]                  
Original face amount $ 6.4 $ 25,000,000.0 $ 6.4 $ 25,000,000.0 £ 4.8 $ 28,200,000.0   $ 25,000,000.0