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LONG-TERM DEBT - 2025 Senior Notes (Details) - USD ($) $ in Thousands |  | 12 Months Ended |  |
--- | --- | --- | --- | ---
Apr. 24, 2017 | Dec. 31, 2017 | Dec. 31, 2019 | Dec. 31, 2018
Issuance of Senior Notes |  |  |  |
Make-whole payment |  | $ 8,148 |  |
Discount and debt issuance costs incurred |  |  | $ 7,929 | $ 10,996
Senior notes due 2025 |  |  |  |
Issuance of Senior Notes |  |  |  |
Principal amount | $ 400,000 |  |  |
Term | 8 years |  |  |
Interest rate (as a percent) | 7.50% |  |  |
Percentage of debt that may be redeemed prior to May 1, 2020 | 35.00% |  |  |
Redemption price expressed as a percentage of principal | 107.50% |  |  |
Make-whole payment | $ 8,100 |  |  |
Discount and debt issuance costs incurred | $ 7,300 |  | $ 4,879 | $ 5,793

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