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SEGMENT INFORMATION - EBITDA Reconciliation (Details) - USD ($) $ in Thousands		12 Months Ended
	Mar. 09, 2018	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Reconciliation of consolidated Segment Adjusted EBITDA to net income
Consolidated Segment Adjusted EBITDA		$ 446,489	$ 672,001	$ 715,691
General and administrative		(59,806)	(72,997)	(68,298)
Depreciation, depletion and amortization		(313,387)	(309,075)	(280,225)
Settlement gain	$ 80,000			80,000
Asset impairment		(24,977)	(15,190)	(40,483)
Goodwill impairment		(132,026)	0	0
Interest expense, net		(45,478)	(45,496)	(40,059)
Acquisition gain			177,043
Income tax (expense) benefit		(35)	211	(22)
Acquisition gain attributable to noncontrolling interest			(7,083)
NET INCOME (LOSS) ATTRIBUTABLE TO ARLP		(129,220)	399,414	366,604
Noncontrolling interest		169	7,512	866
NET INCOME (LOSS)		$ (129,051)	$ 406,926	$ 367,470

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The amount of net gain (loss) recognized by the entity as a result of remeasuring to fair value the equity interest in the acquiree it held before the business combination that is attributable to noncontrolling interest.

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