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Commitments and Contingencies (Narrative) (Details) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 12 Months Ended
Mar. 29, 2018
Feb. 01, 2018
May 31, 2017
Jun. 30, 2015
Mar. 31, 2018
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Jun. 30, 2016
Operating Leased Assets [Line Items]                  
Lease termination charge           $ (1,481) $ 0 $ 0  
Impairment of leasehold           5,700      
Reduction in future required rental payments due to lease termination           23,000      
Capital leases, future minimum payments due           3,900 $ 7,100 $ 7,000  
Rent expense, net           5,300      
New York Lease                  
Operating Leased Assets [Line Items]                  
Lease termination, percentage of office space   32.00%              
Lease termination surrender fee         $ 2,600        
Lease termination charge         3,200        
Impairment of leasehold         4,000        
Monthly rental payments included in agreement           300      
New Denver Lease                  
Operating Leased Assets [Line Items]                  
Term for rent holiday       4 months          
Tenant incentive/allowance                 $ 2,600
Average monthly fixed rent payment           $ 100      
Denver Lease                  
Operating Leased Assets [Line Items]                  
Lease termination, percentage of office space 38.00%                
Lease termination surrender fee         900        
Lease termination charge         $ 1,000        
Australia Lease                  
Operating Leased Assets [Line Items]                  
Average monthly fixed rent payment     $ 34            
California | Total Loan Originations | Geographic Concentration Risk                  
Operating Leased Assets [Line Items]                  
Concentration risk, percentage           15.00% 14.00%    
Florida | Total Loan Originations | Geographic Concentration Risk                  
Operating Leased Assets [Line Items]                  
Concentration risk, percentage           9.00% 9.00%    
Texas | Total Loan Originations | Geographic Concentration Risk                  
Operating Leased Assets [Line Items]                  
Concentration risk, percentage           9.00% 9.00%