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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
NET INCOME $ 164,971 $ 57,724 $ 363,714 $ 126,715
OTHER COMPREHENSIVE INCOME:        
OTHER COMPREHENSIVE INCOME 802 2,231 2,386 6,693
COMPREHENSIVE INCOME 165,773 59,955 366,100 133,408
Less: Comprehensive income attributable to noncontrolling interest (364) (176) (977) (384)
COMPREHENSIVE INCOME ATTRIBUTABLE TO ARLP 165,409 59,779 365,123 133,024
Defined benefit pension plan        
OTHER COMPREHENSIVE INCOME:        
Amortization of prior service cost [1] 47 47 140 140
Amortization of net actuarial loss [1] 495 1,141 1,467 3,424
Total recognized in accumulated other comprehensive loss 542 1,188 1,607 3,564
Pneumoconiosis benefits        
OTHER COMPREHENSIVE INCOME:        
Amortization of net actuarial loss [1] 260 1,043 779 3,129
Total recognized in accumulated other comprehensive loss $ 260 $ 1,043 $ 779 $ 3,129
[1] Amortization of prior service cost and net actuarial loss is included in the computation of net periodic benefit cost (see Notes 14 and 16 for additional details).