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LONG-TERM DEBT - Components (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Principal    
Aggregate maturities of long-term debt $ 450,722 $ 603,780
Less current maturities (16,770) (73,199)
Total long-term debt 433,952 530,581
Unamortized Discount and Debt Issuance Costs    
Unamortized debt issuance costs including current and non-current (8,877) (11,160)
Total unamortized debt issuance costs (8,877) (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 (5,599) (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 (3,278) (3,964)
Securitization Facility    
Principal    
Aggregate maturities of long-term debt   55,900
May 2019 equipment financing    
Principal    
Aggregate maturities of long-term debt 2,387 4,956
November 2019 equipment financing    
Principal    
Aggregate maturities of long-term debt 34,617 42,367
June 2020 equipment financing    
Principal    
Aggregate maturities of long-term debt 10,488 $ 13,057
Line of credit    
Principal    
Aggregate maturities of long-term debt $ 3,230