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LONG-TERM DEBT - Components (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Principal    
Long-term debt including current and non-current $ 500,000 $ 550,000
Less current maturities (100,000) (150,000)
Total long-term debt 400,000 400,000
Unamortized Debt Issuance Costs    
Unamortized debt issuance costs including current and non-current (14,551) (680)
Less current maturities   126
Total unamortized debt issuance costs (14,551) (554)
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)
2025 Senior Notes    
Principal    
Long-term debt including current and non-current 400,000  
Unamortized Debt Issuance Costs    
Unamortized debt issuance costs including current and non-current (6,936)  
ARLP Securitization facility    
Principal    
Long-term debt including current and non-current 100,000 100,000
ARLP Credit Agreement | ARLP Revolving credit facility    
Unamortized Debt Issuance Costs    
Unamortized debt issuance costs including current and non-current $ (7,615)  
ARLP 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)
ARLP Replaced Credit Agreement | ARLP Replaced Term Loan    
Principal    
Long-term debt including current and non-current   50,000
Unamortized Debt Issuance Costs    
Unamortized debt issuance costs including current and non-current   $ (126)