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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
NET INCOME $ 155,351 $ 168,072 $ 519,334 $ 370,296
OTHER COMPREHENSIVE INCOME:        
OTHER COMPREHENSIVE INCOME 561 802 1,689 2,386
COMPREHENSIVE INCOME 155,912 168,874 521,023 372,682
Less: Comprehensive income attributable to noncontrolling interest (1,652) (364) (4,660) (977)
COMPREHENSIVE INCOME ATTRIBUTABLE TO ARLP 154,260 168,510 516,363 371,705
Defined benefit pension plan        
OTHER COMPREHENSIVE INCOME:        
Amortization of prior service cost (1) 47 47 140 140
Amortization of net actuarial loss (1) 169 495 513 1,467
Total recognized in accumulated other comprehensive loss 216 542 653 1,607
Pneumoconiosis benefits        
OTHER COMPREHENSIVE INCOME:        
Amortization of net actuarial loss (1) 345 260 1,036 779
Total recognized in accumulated other comprehensive loss $ 345 $ 260 $ 1,036 $ 779