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COMMON UNIT-BASED COMPENSATION PLANS - LTIP Grants (Details) - ARLP LTIP - USD ($)
$ / shares in Units, $ in Thousands
 6 Months Ended
Jun. 30, 2023
Dec. 31, 2022
Number of units    
Balance at the beginning of the period (in units) 3,697,133  
Granted (in units) 447,225  
Vested (in units) (1,291,330)  
Forfeited (in units) (145,584)  
Balance at the end of the period (in units) 2,707,444  
Weighted average grant date fair value per unit    
Balance at the beginning of the period (in dollars per unit) $ 7.40  
Granted (in dollars per unit) 21.54  
Vested (in dollars per unit) 5.02  
Forfeited (in dollars per unit) 6.86  
Balance at the end of the period (in dollars per unit) $ 10.90  
Intrinsic value (in dollars)    
Intrinsic value of outstanding grants (in dollars) $ 50,061 $ 75,126
Other information    
Common units issued 860,060