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LONG-TERM DEBT, DERIVATIVES AND LETTERS OF CREDIT - Long-Term Debt Balances (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Debt Instrument [Line Items] |  |  |
Total long-term debt and capital lease obligations |  | $ 357,383 | $ 387,749
Less: current portion of long-term debt and capital lease obligations |  | 569 | 0
Total long-term debt and capital lease obligations, less current portion |  | 356,814 | 387,749
Credit Facility |  |  |
Debt Instrument [Line Items] |  |  |
Total long-term debt and capital lease obligations |  | 156,843 | 177,857
Convertible debt |  |  |
Debt Instrument [Line Items] |  |  |
Total long-term debt and capital lease obligations | [1] | 195,184 | 209,892
Capital lease obligations |  |  |
Debt Instrument [Line Items] |  |  |
Total long-term debt and capital lease obligations |  | $ 5,356 | $ 0
[1] | Comprised of principal amount outstanding plus embedded derivative liability (if any), less unamortized discount and issuance costs. See Convertible Debt section below for additional information.

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