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LONG-TERM DEBT - Components (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Principal    
Aggregate maturities of long-term debt $ 671,762 $ 789,280
Less current maturities (89,271) (13,157)
Total long-term debt 582,491 776,123
Unamortized Discount and Debt Issuance Costs    
Unamortized debt issuance costs including current and non-current (11,472) (7,929)
Total unamortized debt issuance costs (11,472) (7,929)
Revolving credit facility    
Principal    
Aggregate maturities of long-term debt 135,000 255,000
Unamortized Discount and Debt Issuance Costs    
Unamortized debt issuance costs including current and non-current (7,280) (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 (4,192) (4,879)
Securitization Facility    
Principal    
Aggregate maturities of long-term debt 72,200 73,800
May 2019 equipment financing    
Principal    
Aggregate maturities of long-term debt 5,785 8,199
November 2019 equipment financing    
Principal    
Aggregate maturities of long-term debt 44,890 $ 52,281
June 2020 equipment financing    
Principal    
Aggregate maturities of long-term debt $ 13,887