BUSINESS ACQUISITIONS - Schedule of Total Consideration (Details) - USD ($) $ in Thousands			12 Months Ended
	Oct. 01, 2019	Sep. 03, 2019	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Business Acquisition [Line Items]
Effective settlement of preexisting relationships			$ 0	$ 0	$ 4,919
Total consideration					1,239,700
Ditech Acquisition
Business Acquisition [Line Items]
Cash consideration	$ 1,213,300
Effective settlement of preexisting relationships	4,900
Total consideration	$ 1,218,200				1,218,200
Guardian
Business Acquisition [Line Items]
Cash consideration		$ 7,600
Earnout payment		13,900
Total consideration		21,500			$ 21,500
Contingent consideration, low		0
Contingent consideration, high		$ 17,500