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Condensed Consolidated Statements of Comprehensive Income - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Net Income $ 61,025 $ 101,509 $ 136,585 $ 261,076
Other Comprehensive Income:        
Foreign currency translation adjustment 41 0 76 0
Change in unrealized gains on debt securities 10,919 0 10,919 0
Other Comprehensive Income 11,194 957 11,464 1,880
Comprehensive Income 72,219 102,466 148,049 262,956
Less: Comprehensive income attributable to noncontrolling interest (1,615) (1,322) (3,192) (2,832)
Comprehensive Income Attributable to ARLP 70,604 101,144 144,857 260,124
Defined benefit pension plan        
Other Comprehensive Income:        
Amortization of prior service cost 2 46 5 93
Amortization of net actuarial loss 0 72 0 109
Total recognized in accumulated other comprehensive Income 2 118 5 202
Pneumoconiosis benefits        
Other Comprehensive Income:        
Amortization of net actuarial loss 232 839 464 1,678
Total recognized in accumulated other comprehensive Income $ 232 $ 839 $ 464 $ 1,678