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LONG-TERM DEBT - 2025 Senior Notes (Details) - USD ($) $ in Thousands | Apr. 24, 2017 | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | --- | ---
Issuance of Senior Notes |  |  |
Discount and debt issuance costs incurred |  | $ 11,472 | $ 7,929
Senior notes due 2025 |  |  |
Issuance of Senior Notes |  |  |
Principal amount | $ 400,000 |  |
Term | 8 years |  |
Interest rate (as a percent) | 7.50% |  |
Discount and debt issuance costs incurred |  | $ 4,192 | $ 4,879

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