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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
NET INCOME $ 101,509 $ 171,305 $ 261,076 $ 363,983
OTHER COMPREHENSIVE INCOME:        
OTHER COMPREHENSIVE INCOME 957 563 1,880 1,128
COMPREHENSIVE INCOME 102,466 171,868 262,956 365,111
Less: Comprehensive income attributable to noncontrolling interest (1,322) (1,515) (2,832) (3,008)
COMPREHENSIVE INCOME ATTRIBUTABLE TO ARLP 101,144 170,353 260,124 362,103
Defined benefit pension plan        
OTHER COMPREHENSIVE INCOME:        
Amortization of prior service cost (1) 46 46 93 93
Amortization of net actuarial loss (1) 72 171 109 344
Total recognized in accumulated other comprehensive Income 118 217 202 437
Pneumoconiosis benefits        
OTHER COMPREHENSIVE INCOME:        
Amortization of net actuarial loss (1) 839 346 1,678 691
Total recognized in accumulated other comprehensive Income $ 839 $ 346 $ 1,678 $ 691