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 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Activity related to carrying value of investments in mortgage servicing rights [Roll Forward]        
Beginning balance     $ 1,735,504  
Purchases     434,763  
Amortization of servicing rights $ (65,439) $ (64,305) (120,566) $ (90,601)
Change in valuation inputs and assumptions 52,632 $ 89,742 182,425 $ 88,983
Ending balance $ 2,232,126   $ 2,232,126