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Other Investments - Additional Information (Details) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended
Mar. 31, 2020
Jan. 31, 2019
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Dec. 31, 2018
Net Investment Income [Line Items]            
Commitment to fund partnership $ 90,000          
Servicing asset, fair value 282,743   $ 282,743   $ 151,582  
Equity method investment earnings     3,000 $ 3,000    
Investment fair value changes, net     (870,832) 20,159    
Interest income     198,081 131,041    
Equity investment income     848 268    
Servicer advance financing            
Net Investment Income [Line Items]            
Collateral amounts 283,000   283,000      
Investment fair value changes, net     (6,000) 1,000    
Residential Loans            
Net Investment Income [Line Items]            
Servicing asset, fair value 298,946   298,946   169,204  
Servicing asset, unpaid principal balance on underlying loan 10,250,000   10,250,000      
Excess MSRs            
Net Investment Income [Line Items]            
Servicing asset, fair value 31,788   31,788   31,814  
Investment fair value changes, net     (9,000) (400)    
Interest income     3,000 2,000    
Light-Renovation Multifamily Loans            
Net Investment Income [Line Items]            
Commitment to fund partnership   $ 78,000        
Commitment to fund partnership, funded amount 54,000   54,000      
Securities acquired from first securitization transaction     28,000      
Carrying amount of investment in partnership 16,000   16,000      
Equity investment income     1,000      
MSRs            
Net Investment Income [Line Items]            
Servicing asset, fair value 23,616   23,616 $ 55,284 42,224 $ 60,281
Servicing asset 4,100,000   4,100,000   $ 4,350,000  
Shared home appreciation options            
Net Investment Income [Line Items]            
Investment fair value changes, net     (8,000)      
Payments to acquire investments 47,000          
Shared home appreciation options | Commitment To Fund Investment            
Net Investment Income [Line Items]            
Commitment to fund loan $ 3,000   $ 3,000