CREDIT FACILITIES AND LONG-TERM DEBT - Mezzanine term debt facilities (Details) $ in Thousands |
Dec. 31, 2020
USD ($)
|
|---|---|
| Debt Instrument [Line Items] | |
| Borrowing Capacity | $ 449,000 |
| Outstanding Amount | 140,000 |
| Issuance Costs | (4,533) |
| Carrying Value | 135,467 |
| Undrawn amounts | 309 |
| Term Debt Facility 2016-M1 | |
| Debt Instrument [Line Items] | |
| Borrowing Capacity | 149,000 |
| Outstanding Amount | $ 40,000 |
| Interest Rate | 10.00% |
| Term Debt Facility 2019-M1 | |
| Debt Instrument [Line Items] | |
| Borrowing Capacity | $ 300,000 |
| Outstanding Amount | $ 100,000 |
| Interest Rate | 10.00% |