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SEGMENT INFORMATION - EBITDA Reconciliation (Details) - USD ($) $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2020	Sep. 30, 2019
Reconciliation of consolidated Segment Adjusted EBITDA to net income
Consolidated Segment Adjusted EBITDA	$ 132,701			$ 156,163			$ 306,458	$ 528,070
General and administrative	(13,871)			(17,885)			(41,131)	(55,218)
Depreciation, depletion and amortization	(80,182)			(72,348)			(237,662)	(220,400)
Asset impairment				(15,190)			(24,977)	(15,190)
Goodwill impairment							(132,026)
Interest expense, net	(11,156)			(11,606)			(34,799)	(33,510)
Acquisition gain								177,043
Income tax expense	(293)			(50)			(111)	(130)
Acquisition gain attributable to noncontrolling interest								(7,083)
NET INCOME (LOSS) ATTRIBUTABLE TO ARLP	27,199			39,084			(164,248)	373,582
Noncontrolling interest	36			117			97	7,407
NET INCOME (LOSS)	$ 27,235	$ (46,679)	$ (144,707)	$ 39,201	$ 58,184	$ 283,604	$ (164,151)	$ 380,989

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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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