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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
SALES AND OPERATING REVENUES:
Revenues	$ 355,651	$ 464,726	$ 961,616	$ 1,508,382
EXPENSES:
Operating expenses (excluding depreciation, depletion and amortization)	216,027	278,254	637,533	895,255
Outside coal purchases		10,599		15,910
General and administrative	13,871	17,885	41,131	55,218
Depreciation, depletion and amortization	80,182	72,348	237,662	220,400
Asset impairments		15,190	24,977	15,190
Goodwill impairment			132,026
Total operating expenses	316,306	414,300	1,090,051	1,284,865
INCOME (LOSS) FROM OPERATIONS	39,345	50,426	(128,435)	223,517
Interest expense (net of interest capitalized for the three and nine months ended September 30, 2020 and 2019 of $199, $298, $1,265 and $790, respectively)	(11,186)	(11,698)	(34,911)	(33,831)
Interest income	30	92	112	321
Equity method investment income	62	659	650	1,533
Equity securities income				12,906
Acquisition gain				177,043
Other expense	(723)	(228)	(1,456)	(370)
INCOME (LOSS) BEFORE INCOME TAXES	27,528	39,251	(164,040)	381,119
INCOME TAX EXPENSE	293	50	111	130
NET INCOME (LOSS)	27,235	39,201	(164,151)	380,989
LESS: NET INCOME ATTRIBUTABLE TO NONCONTROLLING INTEREST	(36)	(117)	(97)	(7,407)
NET INCOME (LOSS) ATTRIBUTABLE TO ARLP	$ 27,199	$ 39,084	$ (164,248)	$ 373,582
EARNINGS PER LIMITED PARTNER UNIT - BASIC AND DILUTED	$ 0.21	$ 0.30	$ (1.29)	$ 2.86
WEIGHTED-AVERAGE NUMBER OF UNITS OUTSTANDING - BASIC AND DILUTED	127,195,219	128,391,191	127,154,398	128,311,609
Coal sales
SALES AND OPERATING REVENUES:
Revenues	$ 335,767	$ 420,005	$ 886,690	$ 1,357,331
EXPENSES:
Operating expenses (excluding depreciation, depletion and amortization)	216,027	278,254	637,533	895,255
Oil & gas royalties
SALES AND OPERATING REVENUES:
Revenues	9,693	13,969	31,718	36,254
Transportation revenues
SALES AND OPERATING REVENUES:
Revenues	6,226	20,024	16,722	82,892
EXPENSES:
Transportation expenses	6,226	20,024	16,722	82,892
Other revenues
SALES AND OPERATING REVENUES:
Revenues	$ 3,965	$ 10,728	$ 26,486	$ 31,905

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