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LONG-TERM DEBT - Credit Facility (Details)
$ in Thousands
 12 Months Ended
Mar. 09, 2020
USD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Long-Term Debt      
Debt issuance costs incurred   $ 113 $ 6,280
Credit Agreement      
Long-Term Debt      
Maximum borrowing capacity   $ 459,500  
Debt issuance costs incurred     $ 6,300
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    
Actual debt to cash flow ratio for trailing twelve months   0.95  
Actual cash flow to interest expense ratio for trailing twelve months   11.91  
ARLP debt arrangements requirements, period over which the ratios are required to be maintained 12 months    
Restricted net assets of subsidiaries   $ 372,000  
Credit Agreement | Eurodollar Rate      
Long-Term Debt      
Effective interest rate (as a percent)   2.45%  
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   0.10  
Revolving credit facility      
Long-Term Debt      
Line of credit facility, available for borrowing   $ 415,400  
Annual commitment fee percentage, undrawn portion   0.35%  
Letters of credit subfacility      
Long-Term Debt      
Maximum borrowing capacity $ 125,000    
Letters of credit outstanding   $ 44,100  
Swingline subfacility      
Long-Term Debt      
Maximum borrowing capacity $ 15,000    
Other      
Long-Term Debt      
Maximum borrowing capacity   5,000  
Letters of credit outstanding   $ 5,000