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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, 2022
Dec. 31, 2021
Number of units    
Balance at the beginning of the period (in units) 3,130,475  
Granted (in units) 687,719  
Forfeited (in units) (165,224)  
Balance at the end of the period (in units) 3,652,970  
Weighted average grant date fair value per unit    
Balance at the beginning of the period (in dollars per unit) $ 5.59  
Granted (in dollars per unit) 13.34  
Forfeited (in dollars per unit) 6.72  
Balance at the end of the period (in dollars per unit) $ 7.00  
Intrinsic value (in dollars)    
Intrinsic value of outstanding grants (in dollars) $ 66,594 $ 39,569
$9.62 minimum-value guarantee    
Other information    
Guaranteed minimum (in dollars per unit) $ 9.62  
$6.41 minimum-value guarantee    
Other information    
Guaranteed minimum (in dollars per unit) $ 6.41