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LONG-TERM DEBT - Components (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Principal    
Aggregate maturities of long-term debt $ 603,780 $ 789,280
Less current maturities (73,199) (13,157)
Total long-term debt 530,581 776,123
Unamortized Discount and Debt Issuance Costs    
Unamortized debt issuance costs including current and non-current (11,160) (7,929)
Total unamortized debt issuance costs (11,160) (7,929)
Revolving credit facility    
Principal    
Aggregate maturities of long-term debt 87,500 255,000
Unamortized Discount and Debt Issuance Costs    
Unamortized debt issuance costs including current and non-current (7,196) (3,050)
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 (3,964) (4,879)
Securitization Facility    
Principal    
Aggregate maturities of long-term debt 55,900 73,800
May 2019 equipment financing    
Principal    
Aggregate maturities of long-term debt 4,956 8,199
November 2019 equipment financing    
Principal    
Aggregate maturities of long-term debt 42,367 $ 52,281
June 2020 equipment financing    
Principal    
Aggregate maturities of long-term debt $ 13,057