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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
NET INCOME $ 171,305 $ 163,851 $ 363,983 $ 202,224
OTHER COMPREHENSIVE INCOME:        
OTHER COMPREHENSIVE INCOME 563 794 1,128 1,584
COMPREHENSIVE INCOME 171,868 164,645 365,111 203,808
Less: Comprehensive income attributable to noncontrolling interest (1,515) (323) (3,008) (613)
COMPREHENSIVE INCOME ATTRIBUTABLE TO ARLP 170,353 164,322 362,103 203,195
Defined benefit pension plan        
OTHER COMPREHENSIVE INCOME:        
Amortization of prior service cost (1) 46 46 93 93
Amortization of net actuarial loss (1) 171 489 344 972
Total recognized in accumulated other comprehensive loss 217 535 437 1,065
Pneumoconiosis benefits        
OTHER COMPREHENSIVE INCOME:        
Amortization of net actuarial loss (1) 346 259 691 519
Total recognized in accumulated other comprehensive loss $ 346 $ 259 $ 691 $ 519