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FAIR VALUE MEASUREMENTS AND FINANCIAL INSTRUMENTS - Narrative (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended 6 Months Ended
Aug. 31, 2018
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 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   31.00% 60.00% 32.00% 61.00%