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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
NET INCOME $ 365,557 $ 636,170 $ 588,158
OTHER COMPREHENSIVE INCOME (LOSS):      
OTHER COMPREHENSIVE INCOME (LOSS) 26,422 (20,471) 23,175
COMPREHENSIVE INCOME 391,979 615,699 611,333
Less: Comprehensive income attributable to noncontrolling interest (4,702) (6,052) (1,958)
COMPREHENSIVE INCOME ATTRIBUTABLE TO ARLP 387,277 609,647 609,375
Defined benefit pension plan      
OTHER COMPREHENSIVE INCOME (LOSS):      
Amortization of prior service cost 186 186 186
Net actuarial gain (loss) 8,507 2,894 10,148
Amortization of net actuarial loss 383 682 1,963
Total recognized in accumulated other comprehensive Income 9,076 3,762 12,297
Pneumoconiosis benefits      
OTHER COMPREHENSIVE INCOME (LOSS):      
Net actuarial gain (loss) 13,990 (25,615) 9,840
Amortization of net actuarial loss 3,356 1,382 1,038
Total recognized in accumulated other comprehensive Income $ 17,346 $ (24,233) $ 10,878