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LONG-TERM DEBT - Components (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Principal    
Long-term debt including current and non-current $ 550,000 $ 819,350
Less current maturities (150,000) (239,350)
Total long-term debt 400,000 580,000
Unamortized Debt Issuance Costs    
Unamortized debt issuance costs including current and non-current (680) (1,844)
Less current maturities 126 334
Total unamortized debt issuance costs (554) (1,510)
Replaced Revolving Credit Facility    
Principal    
Long-term debt including current and non-current 255,000 385,000
Unamortized Debt Issuance Costs    
Unamortized debt issuance costs including current and non-current (453) (1,234)
Replaced Term Loan    
Principal    
Long-term debt including current and non-current 50,000 206,250
Unamortized Debt Issuance Costs    
Unamortized debt issuance costs including current and non-current (126) (441)
ARLP Series B Senior Notes    
Principal    
Long-term debt including current and non-current 145,000 145,000
Unamortized Debt Issuance Costs    
Unamortized debt issuance costs including current and non-current (101) (169)
ARLP Securitization facility    
Principal    
Long-term debt including current and non-current $ 100,000 $ 83,100