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DEBT OBLIGATIONS, NET - Financing Strategy in Current Market Conditions (Details)
$ / shares in Units, $ in Thousands
May 01, 2020
USD ($)
counterparty
Apr. 30, 2020
USD ($)
$ / shares
shares
Apr. 27, 2020
USD ($)
Apr. 28, 2020
USD ($)
[1]
Apr. 01, 2020
USD ($)
Mar. 31, 2020
USD ($)
$ / shares
shares
Jan. 30, 2020
Dec. 31, 2019
USD ($)
$ / shares
shares
Mar. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Debt Instrument [Line Items]                    
Debt obligations, net [1]           $ 5,681,020   $ 4,859,873    
Cash, cash equivalents and restricted cash           622,221   355,746 $ 125,233 $ 98,450
Cash and cash equivalents           358,352 [1]   58,171 [1] 45,158  
Restricted cash           $ 263,869   $ 297,575 $ 80,075  
Class A Common Stock                    
Debt Instrument [Line Items]                    
Common stock, authorized (in shares) | shares           600,000,000   600,000,000    
Common stock, par value (in dollars per share) | $ / shares           $ 0.001   $ 0.001    
Senior Unsecured Notes | Senior Notes Due 2027                    
Debt Instrument [Line Items]                    
Stated interest rate on debt instrument             4.25%      
Maturing February 11 2021 | Revolving Credit Facility                    
Debt Instrument [Line Items]                    
Committed financing           $ 266,430        
Subsequent Event                    
Debt Instrument [Line Items]                    
FHLB advances outstanding $ 487,000                  
FHLB reduction 520,600                  
Debt obligations, net 783,000     $ 830,000            
Loans financed     $ 481,300              
Advance rate     64.50%              
Subordinate and controlling interest     35.00%              
Cash, cash equivalents and restricted cash 830,000                  
Unencumbered assets 2,700,000                  
Subsequent Event | Senior Unsecured Notes | Senior Notes Due 2027                    
Debt Instrument [Line Items]                    
Loan repurchase debt outstanding $ 414,000       $ 123,000          
Number of bank counterparties | counterparty 5                  
Subsequent Event | Secured Debt | Non-Recourse Notes | Koch Real Estate Investments, LLC                    
Debt Instrument [Line Items]                    
Non-mark to market financing facility   $ 206,400                
Maturity period   36 months                
Minimum interest premium   $ 39,200                
Subsequent Event | Secured Debt | Class A Common Stock | Non-Recourse Notes | Koch Real Estate Investments, LLC                    
Debt Instrument [Line Items]                    
Common stock, authorized (in shares) | shares   4,000,000.0                
Common stock, par value (in dollars per share) | $ / shares   $ 8.00                
Subsequent Event | Secured Debt | London Interbank Offered Rate (LIBOR) | Maximum | Non-Recourse Notes | Koch Real Estate Investments, LLC                    
Debt Instrument [Line Items]                    
Stated interest rate on debt instrument   10.00%                
Subsequent Event | Secured Debt | London Interbank Offered Rate (LIBOR) | Minimum | Non-Recourse Notes | Koch Real Estate Investments, LLC                    
Debt Instrument [Line Items]                    
Stated interest rate on debt instrument   0.75%                
CLO Debt | Subsequent Event | Non-Recourse Notes                    
Debt Instrument [Line Items]                    
Debt obligations, net     $ 310,200              
[1]
Includes amounts relating to consolidated variable interest entities. See Note 1.