SERVICER ADVANCE INVESTMENTS - Summary of Investments in Servicer Advances (Details) - Servicer Advance Investments - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Investments in and Advances to Affiliates [Line Items]
Amortized Cost Basis	$ 931,465		$ 3,924,003
Carrying Value	$ 955,364		$ 4,027,379
Weighted Average Discount Rate	5.80%		6.80%
Weighted Average Yield	5.80%		7.30%
Weighted Average Life (Years)	4 years 11 months 23 days		5 years 1 month 2 days
Change in Fair Value of Servicer Advance Investments	$ (79,476)	$ 2,559

Amortized cost of servicer advance investments as of the balance sheet date. Servicer advances are generally reimbursable cash payments made by a servicer when the borrower fails to make scheduled payments due on a mortgage loan or when the servicer makes cash payments (i) on behalf of a borrower for real estate taxes and insurance premiums on the property that have not been paid on a timely basis by the borrower and (ii) to third parties for the costs and expenses incurred in connection with the foreclosure, preservation and sale of the mortgage property, including attorneys' and other professional fees.

No definition available.

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