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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
NET INCOME (LOSS) $ 178,755 $ (129,051) $ 406,926
OTHER COMPREHENSIVE INCOME (LOSS):      
Total recognized in accumulated other comprehensive loss 23,445 (9,681) (31,122)
OTHER COMPREHENSIVE INCOME 23,445 (9,681) (31,122)
COMPREHENSIVE INCOME (LOSS) 202,200 (138,732) 375,804
Less: Comprehensive income attributable to noncontrolling interest (598) (169) (7,512)
COMPREHENSIVE INCOME (LOSS) ATTRIBUTABLE TO ARLP 201,602 (138,901) 368,292
Defined benefit pension plan      
OTHER COMPREHENSIVE INCOME (LOSS):      
Amortization of prior service cost 186 186 186
Net actuarial gain (loss) 14,921 (5,522) (7,350)
Amortization of net actuarial loss (gain) 4,327 4,128 3,922
Total recognized in accumulated other comprehensive loss 19,434 (1,208) (3,242)
Pneumoconiosis benefits      
OTHER COMPREHENSIVE INCOME (LOSS):      
Net actuarial gain (loss) (161) (7,787) (23,298)
Amortization of net actuarial loss (gain) 4,172 (686) (4,582)
Total recognized in accumulated other comprehensive loss $ 4,011 $ (8,473) $ (27,880)