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LONG-TERM DEBT - Long-Term Debt Balances (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Debt Instrument [Line Items] |  |  |
Total debt and finance lease obligations |  | $ 363,628 | $ 312,496
Finance lease obligations |  | 5,792 | 5,153
Current portion of long-term debt and finance lease obligations |  | (663) | (337)
Total long-term debt and finance lease obligations, less current portion |  | 362,965 | 312,159
Secured Debt |  |  |
Debt Instrument [Line Items] |  |  |
Total debt and finance lease obligations |  | 270,977 | 222,809
Secured Debt | Term Loan |  |  |
Debt Instrument [Line Items] |  |  |
Total debt and finance lease obligations | [1] | 216,877 | 213,809
Convertible debt |  |  |
Debt Instrument [Line Items] |  |  |
Total debt and finance lease obligations | [1] | 86,859 | 84,534
Revolving Credit Facility | ABL Facility |  |  |
Debt Instrument [Line Items] |  |  |
Total debt and finance lease obligations |  | $ 54,100 | $ 9,000
[1] | Comprised of principal amount outstanding, less unamortized discount and issuance costs.

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