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Condensed Consolidated Statements of Comprehensive Income - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Net Income $ 96,818 $ 86,916 $ 233,403 $ 347,992
Other Comprehensive Income:        
Foreign currency translation adjustment 51 0 127 0
Change in unrealized gains on debt securities (685) 0 10,234 0
Other Comprehensive Income (400) 1,022 11,064 2,902
Comprehensive Income 96,418 87,938 244,467 350,894
Less: Comprehensive income attributable to noncontrolling interest (1,714) (635) (4,906) (3,467)
Comprehensive Income Attributable to ARLP 94,704 87,303 239,561 347,427
Defined benefit pension plan        
Other Comprehensive Income:        
Amortization of prior service cost 2 47 7 140
Amortization of net actuarial loss 0 136 0 245
Total recognized in accumulated other comprehensive Income 2 183 7 385
Pneumoconiosis benefits        
Other Comprehensive Income:        
Amortization of net actuarial loss 232 839 696 2,517
Total recognized in accumulated other comprehensive Income $ 232 $ 839 $ 696 $ 2,517