Line items represent reporting concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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SERVICER ADVANCE INVESTMENTS - Schedule of Interest Income Related to Investments in Servicer Advances - Others' Interests (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Jun. 30, 2018	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Others
Investment [Line Items]
Investment in equity	$ 54,118			$ 54,118		$ 71,491
Ownership interest	26.80%			26.80%		27.20%
Net income	$ (81)	$ 1,224		$ 2,358	$ 10,372
Noncontrolling ownership interest in net income	27.10%	34.20%	27.20%	27.20%	50.70%
Servicer Advance Investments
Investment [Line Items]
Investment in equity	$ 202,184			$ 202,184		$ 262,755
Ownership interest	73.20%			73.20%
Net income	$ (299)	$ 3,584		$ 8,667	$ 20,460