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LONG-TERM DEBT - Components (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Principal    
Aggregate maturities of long-term debt $ 491,774 $ 603,780
Less current maturities (55,558) (73,199)
Total long-term debt 436,216 530,581
Unamortized Discount and Debt Issuance Costs    
Unamortized debt issuance costs including current and non-current (9,573) (11,160)
Total unamortized debt issuance costs (9,573) (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 (6,067) (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 (3,506) (3,964)
Securitization Facility    
Principal    
Aggregate maturities of long-term debt 38,100 55,900
May 2019 equipment financing    
Principal    
Aggregate maturities of long-term debt 3,256 4,956
November 2019 equipment financing    
Principal    
Aggregate maturities of long-term debt 37,231 42,367
June 2020 equipment financing    
Principal    
Aggregate maturities of long-term debt 11,357 $ 13,057
Line of credit    
Principal    
Aggregate maturities of long-term debt $ 1,830