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
$ in Thousands
3 Months Ended
Mar. 31, 2019
USD ($)
Activity related to carrying value of investments in mortgage servicing rights [Roll Forward]  
Beginning balance $ 2,884,100
Purchases 155,747
Transfer Out (258)
Originations 36,429
Proceeds from sales 0
Amortization of servicing rights (73,946)
Change in valuation inputs and assumptions 15,381
Ending balance $ 3,017,453