Quarterly report pursuant to Section 13 or 15(d)

DEBT OBLIGATIONS - Carrying Value of Debt Obligations (Details)

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DEBT OBLIGATIONS - Carrying Value of Debt Obligations (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Debt Instrument [Roll Forward]    
Beginning balance $ 15,746,530  
Borrowings 33,542,060 $ 23,815,777
Repayments (33,450,992) $ (20,745,543)
Ending balance 15,464,910  
Excess MSRs    
Debt Instrument [Roll Forward]    
Beginning balance 483,978  
Ending balance 197,563  
MSRs    
Debt Instrument [Roll Forward]    
Beginning balance 1,157,179  
Ending balance 1,888,618  
Servicer Advances    
Debt Instrument [Roll Forward]    
Beginning balance 4,060,156  
Ending balance 3,532,641  
Real Estate Securities    
Debt Instrument [Roll Forward]    
Beginning balance 6,694,454  
Ending balance 6,527,507  
Residential Mortgage Loans and REO    
Debt Instrument [Roll Forward]    
Beginning balance 2,108,007  
Ending balance 2,237,388  
Consumer Loans    
Debt Instrument [Roll Forward]    
Beginning balance 1,242,756  
Ending balance 1,081,193  
Repurchase Agreements    
Debt Instrument [Roll Forward]    
Borrowings 33,542,060  
Repayments (33,447,609)  
Capitalized deferred financing costs, net of amortization 544  
Repurchase Agreements | Excess MSRs    
Debt Instrument [Roll Forward]    
Borrowings 0  
Repayments 0  
Capitalized deferred financing costs, net of amortization 0  
Repurchase Agreements | MSRs    
Debt Instrument [Roll Forward]    
Borrowings 0  
Repayments 0  
Capitalized deferred financing costs, net of amortization 0  
Repurchase Agreements | Servicer Advances    
Debt Instrument [Roll Forward]    
Borrowings 0  
Repayments 0  
Capitalized deferred financing costs, net of amortization 0  
Repurchase Agreements | Real Estate Securities    
Debt Instrument [Roll Forward]    
Borrowings 32,519,734  
Repayments (32,686,681)  
Capitalized deferred financing costs, net of amortization 0  
Repurchase Agreements | Residential Mortgage Loans and REO    
Debt Instrument [Roll Forward]    
Borrowings 1,022,326  
Repayments (760,928)  
Capitalized deferred financing costs, net of amortization 544  
Repurchase Agreements | Consumer Loans    
Debt Instrument [Roll Forward]    
Borrowings 0  
Repayments 0  
Capitalized deferred financing costs, net of amortization 0  
Notes Payable    
Debt Instrument [Roll Forward]    
Borrowings 4,683,103  
Repayments (5,053,552)  
Discount on borrowings, net of amortization 763  
Capitalized deferred financing costs, net of amortization (6,928)  
Notes Payable | Excess MSRs    
Debt Instrument [Roll Forward]    
Beginning balance 483,978  
Borrowings 0  
Repayments (286,440)  
Discount on borrowings, net of amortization 0  
Capitalized deferred financing costs, net of amortization 25  
Ending balance 197,563  
Notes Payable | MSRs    
Debt Instrument [Roll Forward]    
Borrowings 2,088,834  
Repayments (1,350,230)  
Discount on borrowings, net of amortization 0  
Capitalized deferred financing costs, net of amortization (7,165)  
Notes Payable | Servicer Advances    
Debt Instrument [Roll Forward]    
Beginning balance 4,060,156  
Borrowings 2,594,269  
Repayments (3,121,736)  
Discount on borrowings, net of amortization 21  
Capitalized deferred financing costs, net of amortization (68)  
Ending balance 3,532,641  
Notes Payable | Real Estate Securities    
Debt Instrument [Roll Forward]    
Borrowings 0  
Repayments 0  
Discount on borrowings, net of amortization 0  
Capitalized deferred financing costs, net of amortization 0  
Notes Payable | Residential Mortgage Loans and REO    
Debt Instrument [Roll Forward]    
Borrowings 0  
Repayments (132,561)  
Discount on borrowings, net of amortization 0  
Capitalized deferred financing costs, net of amortization 0  
Notes Payable | Consumer Loans    
Debt Instrument [Roll Forward]    
Beginning balance 1,242,756  
Borrowings 0  
Repayments (162,585)  
Discount on borrowings, net of amortization 742  
Capitalized deferred financing costs, net of amortization 280  
Ending balance $ 1,081,193