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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
SALES AND OPERATING REVENUES:
Revenues	$ 415,439	$ 355,651	$ 1,096,504	$ 961,616
EXPENSES:
Outside coal purchases	6,065		6,179
General and administrative	18,655	13,871	51,651	41,131
Depreciation, depletion and amortization	68,763	80,182	192,698	237,662
Asset impairments				24,977
Goodwill impairment				132,026
Total operating expenses	348,711	316,306	938,441	1,090,051
INCOME (LOSS) FROM OPERATIONS	66,728	39,345	158,063	(128,435)
Interest expense (net of interest capitalized for the three and nine months ended September 30, 2021 and 2020 of $123, $199, $314 and $1,265, respectively)	(9,408)	(11,186)	(29,646)	(34,911)
Interest income	19	30	51	112
Equity method investment income	703	62	1,106	650
Other expense	(84)	(723)	(2,632)	(1,456)
INCOME (LOSS) BEFORE INCOME TAXES	57,958	27,528	126,942	(164,040)
INCOME TAX EXPENSE	234	293	227	111
NET INCOME (LOSS)	57,724	27,235	126,715	(164,151)
LESS: NET INCOME ATTRIBUTABLE TO NONCONTROLLING INTEREST	(176)	(36)	(384)	(97)
NET INCOME (LOSS) ATTRIBUTABLE TO ARLP	$ 57,548	$ 27,199	$ 126,331	$ (164,248)
EARNINGS PER LIMITED PARTNER UNIT - BASIC AND DILUTED	$ 0.44	$ 0.21	$ 0.97	$ (1.29)
WEIGHTED-AVERAGE NUMBER OF UNITS OUTSTANDING - BASIC AND DILUTED	127,195,219	127,195,219	127,195,219	127,154,398
Product
EXPENSES:
Operating expenses (excluding depreciation, depletion and amortization)	$ 233,201	$ 216,027	$ 642,760	$ 637,533
Coal sales
SALES AND OPERATING REVENUES:
Revenues	362,264	335,767	975,725	886,690
Oil & gas royalties
SALES AND OPERATING REVENUES:
Revenues	20,109	9,693	51,222	31,718
Transportation
SALES AND OPERATING REVENUES:
Revenues	22,027	6,226	45,153	16,722
EXPENSES:
Operating expenses (excluding depreciation, depletion and amortization)	22,027	6,226	45,153	16,722
Other revenues
SALES AND OPERATING REVENUES:
Revenues	$ 11,039	$ 3,965	$ 24,404	$ 26,486

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