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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
NET INCOME $ 36,942 $ 24,826
OTHER COMPREHENSIVE INCOME:    
OTHER COMPREHENSIVE INCOME 790 2,231
COMPREHENSIVE INCOME 37,732 27,057
Less: Comprehensive income attributable to noncontrolling interest (290) (78)
COMPREHENSIVE INCOME ATTRIBUTABLE TO ARLP 37,442 26,979
Defined benefit pension plan    
OTHER COMPREHENSIVE INCOME:    
Amortization of prior service cost 47 47
Amortization of net actuarial loss 483 1,141
Total recognized in accumulated other comprehensive loss 530 1,188
Pneumoconiosis benefits    
OTHER COMPREHENSIVE INCOME:    
Amortization of net actuarial loss 260 1,043
Total recognized in accumulated other comprehensive loss $ 260 $ 1,043