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SEGMENT INFORMATION - EBITDA Reconciliation (Details) - USD ($) $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2021	Sep. 30, 2020
Reconciliation of consolidated Segment Adjusted EBITDA to net income
Consolidated Segment Adjusted EBITDA	$ 154,589			$ 132,701			$ 400,502	$ 306,458
General and administrative	(18,655)			(13,871)			(51,651)	(41,131)
Depreciation, depletion and amortization	(68,763)			(80,182)			(192,698)	(237,662)
Asset impairment								(24,977)
Goodwill impairment								(132,026)
Interest expense, net	(9,389)			(11,156)			(29,595)	(34,799)
Income tax (expense) benefit	(234)			(293)			(227)	(111)
NET INCOME (LOSS) ATTRIBUTABLE TO ARLP	57,548			27,199			126,331	(164,248)
Noncontrolling interest	176			36			384	97
NET INCOME (LOSS)	$ 57,724	$ 44,165	$ 24,826	$ 27,235	$ (46,679)	$ (144,707)	$ 126,715	$ (164,151)

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