Quarterly report pursuant to Section 13 or 15(d)

INVESTMENTS IN MORTGAGE SERVICING RIGHTS AND MORTGAGE SERVICING RIGHTS FINANCING RECEIVABLES - Rollforward of Carrying Value of Investments In MSRs (Details)

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INVESTMENTS IN MORTGAGE SERVICING RIGHTS AND MORTGAGE SERVICING RIGHTS FINANCING RECEIVABLES - Rollforward of Carrying Value of Investments In MSRs (Details) - MSRs - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Activity related to carrying value of investments in mortgage servicing rights [Roll Forward]        
Beginning balance     $ 1,735,504  
Purchases     801,366  
Transfers     135,288  
Shellpoint Acquisition     151,312  
Originations     17,282  
Amortization of servicing rights $ (70,933) $ (68,850) (191,499) $ (159,451)
Change in valuation inputs and assumptions     222,751  
Ending balance $ 2,872,004   2,872,004  
New Penn        
Activity related to carrying value of investments in mortgage servicing rights [Roll Forward]        
Shellpoint Acquisition     $ 48,300