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LONG-TERM DEBT - Credit Facility (Details)
$ in Thousands
 12 Months Ended
Mar. 09, 2020
USD ($)
item
Dec. 31, 2020
USD ($)
Jan. 27, 2017
USD ($)
Long-Term Debt      
Debt issuance costs incurred   $ 6,280  
Credit Agreement      
Long-Term Debt      
Maximum borrowing capacity $ 537,750    
Debt issuance costs incurred   $ 6,300  
Number of benchmarks | item 3    
ARLP debt arrangements requirements, fixed charge coverage ratio 1.0    
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   1.53  
Actual cash flow to interest expense ratio for trailing twelve months   8.45  
Restricted net assets of subsidiaries   $ 240,800  
Credit Agreement | Eurodollar Rate      
Long-Term Debt      
Effective interest rate (as a percent)   3.01%  
Credit Agreement | Extended Commitment to May 23, 2021      
Long-Term Debt      
Maximum borrowing capacity $ 459,500    
Credit Agreement | Credit Agreement, first lien      
Long-Term Debt      
ARLP debt arrangements requirements, debt to cash flow ratio 1.5    
Actual debt to cash flow ratio for trailing twelve months   0.52  
Revolving credit facility      
Long-Term Debt      
Maximum borrowing capacity     $ 494,750
Line of credit facility, available for borrowing   $ 428,500  
Annual commitment fee percentage, undrawn portion   0.35%  
Letters of credit subfacility      
Long-Term Debt      
Maximum borrowing capacity $ 125,000    
Letters of credit outstanding   $ 21,800  
Swingline subfacility      
Long-Term Debt      
Maximum borrowing capacity $ 15,000    
Letters of credit - Other      
Long-Term Debt      
Maximum borrowing capacity   5,000  
Letters of credit outstanding   $ 5,000