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SEGMENT INFORMATION - EBITDA Reconciliation (Details) - USD ($) $ in Thousands		12 Months Ended
	Mar. 09, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Reconciliation of consolidated Segment Adjusted EBITDA to net income
Consolidated Segment Adjusted EBITDA		$ 672,001	$ 715,691	$ 682,028
General and administrative		(72,997)	(68,298)	(61,760)
Depreciation, depletion and amortization		(309,075)	(280,225)	(268,981)
Settlement gain	$ 80,000		80,000
Asset impairment		(15,190)	(40,483)
Interest expense, net		(45,496)	(40,059)	(39,291)
Acquisition gain		177,043
Debt extinguishment loss				8,148
Income tax (expense) benefit		211	(22)	(210)
Acquisition gain attributable to noncontrolling interest		(7,083)
NET INCOME ATTRIBUTABLE TO ARLP		399,414	366,604	303,638
Noncontrolling interest		7,512	866	563
NET INCOME		$ 406,926	$ 367,470	$ 304,201

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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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