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FAIR VALUE MEASUREMENTS AND FINANCIAL INSTRUMENTS - Narrative (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended
Aug. 31, 2018
Mar. 31, 2021
Mar. 31, 2020
Discontinued Operations, Disposed of by Sale | Rental Property Management Business      
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Future proceeds from the sale of business, second installment $ 3.0    
Revenue | Customer Concentration Risk | Ocwen      
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Percentage of revenue from largest customer   34.00% 61.00%