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LONG-TERM DEBT - Components (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Principal
Aggregate maturities of long-term debt	$ 434,386	$ 443,080
Less current maturities	(14,942)	(16,071)
Total long-term debt	419,444	427,009
Unamortized Discount and Debt Issuance Costs
Unamortized debt issuance costs including current and non-current	(6,453)	(8,067)
Total unamortized debt issuance costs	(6,453)	(8,067)
Revolving credit facility
Unamortized Discount and Debt Issuance Costs
Unamortized debt issuance costs including current and non-current	(3,861)	(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	(2,592)	(3,048)
May 2019 equipment financing
Principal
Aggregate maturities of long-term debt		1,503
November 2019 equipment financing
Principal
Aggregate maturities of long-term debt	26,587	31,972
June 2020 equipment financing
Principal
Aggregate maturities of long-term debt	$ 7,799	$ 9,605

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