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LONG-TERM DEBT - Components (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Principal    
Long-term debt including current and non-current $ 502,400 $ 550,000
Less current maturities (72,400) (150,000)
Total long-term debt 430,000 400,000
Unamortized Debt Issuance Costs    
Unamortized debt issuance costs including current and non-current (14,063) (680)
Less current maturities   126
Total unamortized debt issuance costs (14,063) (554)
ARLP Senior notes due 2025    
Principal    
Long-term debt including current and non-current 400,000  
Unamortized Debt Issuance Costs    
Unamortized debt issuance costs including current and non-current (6,707)  
ARLP Securitization facility    
Principal    
Long-term debt including current and non-current 72,400 100,000
ARLP Credit Agreement | ARLP Revolving credit facility    
Principal    
Long-term debt including current and non-current 30,000  
Unamortized Debt Issuance Costs    
Unamortized debt issuance costs including current and non-current $ (7,356)  
Replaced Credit Agreement    
Principal    
Long-term debt including current and non-current   50,000
Replaced Credit Agreement | Replaced Revolving Credit Facility    
Principal    
Long-term debt including current and non-current   255,000
Unamortized Debt Issuance Costs    
Unamortized debt issuance costs including current and non-current   (453)
Replaced Credit Agreement | ARLP Series B Senior Notes    
Principal    
Long-term debt including current and non-current   145,000
Unamortized Debt Issuance Costs    
Unamortized debt issuance costs including current and non-current   (101)
Replaced Credit Agreement | Replaced ARLP Term Loan    
Unamortized Debt Issuance Costs    
Unamortized debt issuance costs including current and non-current   $ (126)