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DEBT - Long-term Debt (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Debt Instrument [Line Items] |  |
Long-term debt, gross | $ 480,228 | $ 510,699
Less: unamortized discount and fees | (5,106) | (5,801)
Less: current portion | 0 | (1,880)
Long-term debt | 475,122 | 503,018
Term loan credit agreement |  |
Debt Instrument [Line Items] |  |
Long-term debt, gross | 155,228 | 185,699
Senior notes due 2025 |  |
Debt Instrument [Line Items] |  |
Long-term debt, gross | $ 325,000 | $ 325,000

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