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LONG-TERM DEBT - Components (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Principal
Aggregate maturities of long-term debt	$ 443,080	$ 603,780
Less current maturities	(16,071)	(73,199)
Total long-term debt	427,009	530,581
Unamortized Discount and Debt Issuance Costs
Unamortized debt issuance costs including current and non-current	(8,067)	(11,160)
Total unamortized debt issuance costs	(8,067)	(11,160)
Revolving credit facility
Principal
Aggregate maturities of long-term debt		87,500
Unamortized Discount and Debt Issuance Costs
Unamortized debt issuance costs including current and non-current	(5,019)	(7,196)
Senior notes due 2025
Principal
Aggregate maturities of long-term debt	400,000	400,000
Unamortized Discount and Debt Issuance Costs
Unamortized debt issuance costs including current and non-current	(3,048)	(3,964)
Securitization Facility
Principal
Aggregate maturities of long-term debt		55,900
May 2019 equipment financing
Principal
Aggregate maturities of long-term debt	1,503	4,956
November 2019 equipment financing
Principal
Aggregate maturities of long-term debt	31,972	42,367
June 2020 equipment financing
Principal
Aggregate maturities of long-term debt	$ 9,605	$ 13,057

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