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SEGMENT INFORMATION - EBITDA Reconciliation (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Reconciliation of consolidated Segment Adjusted EBITDA to net income      
Consolidated Segment Adjusted EBITDA $ 549,252 $ 446,489 $ 672,001
General and administrative (70,160) (59,806) (72,997)
Depreciation, depletion and amortization (261,377) (313,387) (309,075)
Asset impairment   (24,977) (15,190)
Goodwill impairment 0 (132,026) 0
Interest expense, net (39,141) (45,478) (45,496)
Acquisition gain     177,043
Income tax (expense) benefit (417) (35) 211
Acquisition gain attributable to noncontrolling interest     (7,083)
NET INCOME (LOSS) ATTRIBUTABLE TO ARLP 178,157 (129,220) 399,414
Noncontrolling interest 598 169 7,512
NET INCOME (LOSS) $ 178,755 $ (129,051) $ 406,926