SEGMENT INFORMATION - EBITDA Reconciliation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Reconciliation of consolidated Segment Adjusted EBITDA to net income
Consolidated Segment Adjusted EBITDA	$ 1,020,558	$ 549,252	$ 446,489
Income tax expense	53,978	417	35
Interest expense, net	35,297	39,141	45,478
Goodwill impairment	0	0	132,026
Asset impairment			24,977
Depreciation, depletion and amortization	273,759	261,377	313,387
General and administrative	80,334	70,160	59,806
NET INCOME (LOSS) ATTRIBUTABLE TO ARLP	577,190	178,157	(129,220)
LESS: NET INCOME ATTRIBUTABLE TO NONCONTROLLING INTEREST	(1,958)	(598)	(169)
NET INCOME (LOSS)	$ 579,148	$ 178,755	$ (129,051)