CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
SALES AND OPERATING REVENUES:
Revenues	$ 2,406,511	$ 1,569,976	$ 1,328,129
EXPENSES:
Outside coal purchases	151	6,372
General and administrative	80,334	70,160	59,806
Depreciation, depletion and amortization	273,759	261,377	313,387
Settlement gain	(6,664)
Asset impairments			24,977
Goodwill impairment	0	0	132,026
Total operating expenses	1,748,075	1,350,773	1,410,981
INCOME (LOSS) FROM OPERATIONS	658,436	219,203	(82,852)
Interest expense (net of interest capitalized of $922, $396 and $1,325, respectively)	(37,332)	(39,229)	(45,613)
Interest income	2,035	88	135
Equity method investment income	5,634	2,130	907
Other income (expense)	4,353	(3,020)	(1,593)
INCOME (LOSS) BEFORE INCOME TAXES	633,126	179,172	(129,016)
INCOME TAX EXPENSE	53,978	417	35
NET INCOME (LOSS)	579,148	178,755	(129,051)
LESS: NET INCOME ATTRIBUTABLE TO NONCONTROLLING INTEREST	(1,958)	(598)	(169)
NET INCOME (LOSS) ATTRIBUTABLE TO ARLP	$ 577,190	$ 178,157	$ (129,220)
EARNINGS PER LIMITED PARTNER UNIT - BASIC (in dollars per unit)	$ 4.39	$ 1.36	$ (1.02)
EARNINGS PER LIMITED PARTNER UNIT - DILUTED (in dollars per unit)	$ 4.39	$ 1.36	$ (1.02)
WEIGHTED-AVERAGE NUMBER OF UNITS OUTSTANDING - BASIC (in units)	127,195,219	127,195,219	127,164,659
WEIGHTED-AVERAGE NUMBER OF UNITS OUTSTANDING - DILUTED (in units)	127,195,000	127,195,000	127,165,000
Product
EXPENSES:
Operating expenses (excluding depreciation, depletion and amortization)	$ 1,286,635	$ 943,257	$ 859,656
Coal sales
SALES AND OPERATING REVENUES:
Revenues	2,102,229	1,386,923	1,232,272
Oil & gas royalties
SALES AND OPERATING REVENUES:
Revenues	138,402	74,988	42,912
Transportation
SALES AND OPERATING REVENUES:
Revenues	113,860	69,607	21,129
EXPENSES:
Operating expenses (excluding depreciation, depletion and amortization)	113,860	69,607	21,129
Other revenues
SALES AND OPERATING REVENUES:
Revenues	$ 52,020	$ 38,458	$ 31,816