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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
NET INCOME $ 636,170 $ 588,158 $ 183,369
OTHER COMPREHENSIVE INCOME (LOSS):      
Total recognized in accumulated other comprehensive loss (20,471) 23,175 23,445
OTHER COMPREHENSIVE INCOME (LOSS) (20,471) 23,175 23,445
COMPREHENSIVE INCOME 615,699 611,333 206,814
Less: Comprehensive income attributable to noncontrolling interest (6,052) (1,958) (598)
COMPREHENSIVE INCOME ATTRIBUTABLE TO ARLP 609,647 609,375 206,216
Defined benefit pension plan      
OTHER COMPREHENSIVE INCOME (LOSS):      
Amortization of prior service cost (1) 186 186 186
Net actuarial gain 2,894 10,148 14,921
Amortization of net actuarial loss (1) 682 1,963 4,327
Total recognized in accumulated other comprehensive loss 3,762 12,297 19,434
Pneumoconiosis benefits      
OTHER COMPREHENSIVE INCOME (LOSS):      
Net actuarial gain (25,615) 9,840 (161)
Amortization of net actuarial loss (1) 1,382 1,038 4,172
Total recognized in accumulated other comprehensive loss $ (24,233) $ 10,878 $ 4,011