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CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
SALES AND OPERATING REVENUES:
Revenues	$ 1,328,129	$ 1,961,720	$ 2,002,857
EXPENSES:
Operating expenses (excluding depreciation, depletion and amortization)	859,656	1,182,100	1,207,713
Outside coal purchases		23,357	1,466
General and administrative	59,806	72,997	68,298
Depreciation, depletion and amortization	313,387	309,075	280,225
Settlement gain			(80,000)
Asset impairments	24,977	15,190	40,483
Goodwill impairment	132,026	0	0
Total operating expenses	1,410,981	1,702,222	1,630,570
INCOME (LOSS) FROM OPERATIONS	(82,852)	259,498	372,287
Interest expense (net of interest capitalized of $1,325, $1,211 and $1,306, respectively)	(45,613)	(45,875)	(40,218)
Interest income	135	379	159
Equity method investment income	907	2,203	22,189
Equity securities income		12,906	15,696
Acquisition gain		177,043
Other income (expense)	(1,593)	561	(2,621)
INCOME (LOSS) BEFORE INCOME TAXES	(129,016)	406,715	367,492
INCOME TAX EXPENSE (BENEFIT)	35	(211)	22
NET INCOME (LOSS)	(129,051)	406,926	367,470
LESS: NET INCOME ATTRIBUTABLE TO NONCONTROLLING INTEREST	(169)	(7,512)	(866)
NET INCOME (LOSS) ATTRIBUTABLE TO ARLP	(129,220)	399,414	366,604
NET INCOME (LOSS) ATTRIBUTABLE TO ARLP
GENERAL PARTNER			1,560
LIMITED PARTNERS	$ (129,220)	$ 399,414	$ 365,044
EARNINGS PER LIMITED PARTNER UNIT - BASIC AND DILUTED	$ (1.02)	$ 3.07	$ 2.74
WEIGHTED-AVERAGE NUMBER OF UNITS OUTSTANDING - BASIC AND DILUTED	127,164,659	128,116,670	130,758,169
Coal sales
SALES AND OPERATING REVENUES:
Revenues	$ 1,232,272	$ 1,762,442	$ 1,844,808
Oil & gas royalties
SALES AND OPERATING REVENUES:
Revenues	42,912	51,735
Transportation revenues
SALES AND OPERATING REVENUES:
Revenues	21,129	99,503	112,385
EXPENSES:
Transportation expenses	21,129	99,503	112,385
Other revenues
SALES AND OPERATING REVENUES:
Revenues	$ 31,816	$ 48,040	$ 45,664

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