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LONG-TERM DEBT - Components (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Principal
Aggregate maturities of long-term debt	$ 438,610	$ 443,080
Less current maturities	(15,359)	(16,071)
Total long-term debt	423,251	427,009
Unamortized Discount and Debt Issuance Costs
Unamortized debt issuance costs including current and non-current	(7,261)	(8,067)
Total unamortized debt issuance costs	(7,261)	(8,067)
Revolving credit facility
Unamortized Discount and Debt Issuance Costs
Unamortized debt issuance costs including current and non-current	(4,441)	(5,019)
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	(2,820)	(3,048)
May 2019 equipment financing
Principal
Aggregate maturities of long-term debt	606	1,503
November 2019 equipment financing
Principal
Aggregate maturities of long-term debt	29,295	31,972
June 2020 equipment financing
Principal
Aggregate maturities of long-term debt	$ 8,709	$ 9,605

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