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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
NET INCOME $ 75,560 $ 159,567
OTHER COMPREHENSIVE INCOME (LOSS):    
Foreign currency translation adjustment 35  
OTHER COMPREHENSIVE INCOME 270 923
COMPREHENSIVE INCOME 75,830 160,490
Less: Comprehensive income attributable to noncontrolling interest (1,577) (1,510)
COMPREHENSIVE INCOME ATTRIBUTABLE TO ARLP 74,253 158,980
Defined benefit pension plan    
OTHER COMPREHENSIVE INCOME (LOSS):    
Amortization of prior service cost 3 47
Amortization of net actuarial loss   37
Total recognized in accumulated other comprehensive Income 3 84
Pneumoconiosis benefits    
OTHER COMPREHENSIVE INCOME (LOSS):    
Amortization of net actuarial loss 232 839
Total recognized in accumulated other comprehensive Income $ 232 $ 839