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LONG-TERM DEBT - Credit Facility (Details)
$ in Thousands
 12 Months Ended
Jan. 27, 2017
USD ($)
item
Dec. 31, 2019
USD ($)
Dec. 31, 2017
USD ($)
Long-Term Debt      
Debt issuance costs incurred     $ 16,487
Credit Agreement      
Long-Term Debt      
Debt issuance costs incurred     $ 9,200
Number of benchmarks | item 3    
ARLP debt arrangements requirements, debt to cash flow ratio 2.5    
ARLP debt arrangements requirements, cash flow to interest expense ratio 3.0    
ARLP debt arrangements requirements, period over which the ratios are required to be maintained 12 months    
Actual debt to cash flow ratio for trailing twelve months   1.34  
Actual cash flow to interest expense ratio for trailing twelve months   12.6  
Credit Agreement | Eurodollar Rate      
Long-Term Debt      
Effective interest rate (as a percent)   4.32%  
Revolving credit facility      
Long-Term Debt      
Maximum borrowing capacity $ 494,750    
Line of credit facility, available for borrowing   $ 230,500  
Annual commitment fee percentage, undrawn portion   0.35%  
Letters of credit subfacility      
Long-Term Debt      
Maximum borrowing capacity 125,000    
Letters of credit outstanding   $ 9,300  
Swingline subfacility      
Long-Term Debt      
Maximum borrowing capacity $ 15,000