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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
NET INCOME (LOSS) $ (129,051) $ 406,926 $ 367,470
OTHER COMPREHENSIVE INCOME (LOSS):      
Total defined benefit pension plan adjustments (9,681) (31,122) 5,069
OTHER COMPREHENSIVE INCOME (LOSS) (9,681) (31,122) 5,069
COMPREHENSIVE INCOME (LOSS) (138,732) 375,804 372,539
Less: Comprehensive income attributable to noncontrolling interest (169) (7,512) (866)
COMPREHENSIVE INCOME (LOSS) ATTRIBUTABLE TO ARLP (138,901) 368,292 371,673
Defined benefit pension plan      
OTHER COMPREHENSIVE INCOME (LOSS):      
Amortization of prior service cost 186 186 186
Net actuarial loss (5,522) (7,350) (3,326)
Amortization of net actuarial gain loss 4,128 3,922 3,608
Total defined benefit pension plan adjustments (1,208) (3,242) 468
Pneumoconiosis benefits      
OTHER COMPREHENSIVE INCOME (LOSS):      
Net actuarial loss (7,787) (23,298) 4,599
Amortization of net actuarial gain loss (686) (4,582) 2
Total defined benefit pension plan adjustments $ (8,473) $ (27,880) $ 4,601