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CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
SALES AND OPERATING REVENUES: |  |  |
Revenues | $ 1,569,976 | $ 1,328,129 | $ 1,961,720
EXPENSES: |  |  |
Operating expenses (excluding depreciation, depletion and amortization) | 943,257 | 859,656 | 1,182,100
Outside coal purchases | 6,372 |  | 23,357
General and administrative | 70,160 | 59,806 | 72,997
Depreciation, depletion and amortization | 261,377 | 313,387 | 309,075
Asset impairments |  | 24,977 | 15,190
Goodwill impairment | 0 | 132,026 | 0
Total operating expenses | 1,350,773 | 1,410,981 | 1,702,222
INCOME (LOSS) FROM OPERATIONS | 219,203 | (82,852) | 259,498
Interest expense (net of interest capitalized of $396, $1,325 and $1,211, respectively) | (39,229) | (45,613) | (45,875)
Interest income | 88 | 135 | 379
Equity method investment income | 2,130 | 907 | 2,203
Equity securities income |  |  | 12,906
Acquisition gain |  |  | 177,043
Other expense | (3,020) | (1,593) | 561
INCOME (LOSS) BEFORE INCOME TAXES | 179,172 | (129,016) | 406,715
INCOME TAX EXPENSE | 417 | 35 | (211)
NET INCOME (LOSS) | 178,755 | (129,051) | 406,926
LESS: NET INCOME ATTRIBUTABLE TO NONCONTROLLING INTEREST | (598) | (169) | (7,512)
NET INCOME (LOSS) ATTRIBUTABLE TO ARLP | $ 178,157 | $ (129,220) | $ 399,414
EARNINGS PER LIMITED PARTNER UNIT - BASIC (in dollars per unit) | $ 1.36 | $ (1.02) | $ 3.07
WEIGHTED-AVERAGE NUMBER OF UNITS OUTSTANDING - BASIC (in units) | 127,195,219 | 127,164,659 | 128,116,670
Coal sales |  |  |
SALES AND OPERATING REVENUES: |  |  |
Revenues | $ 1,386,923 | $ 1,232,272 | $ 1,762,442
Oil & gas royalties |  |  |
SALES AND OPERATING REVENUES: |  |  |
Revenues | 74,988 | 42,912 | 51,735
Transportation revenues |  |  |
SALES AND OPERATING REVENUES: |  |  |
Revenues | 69,607 | 21,129 | 99,503
EXPENSES: |  |  |
Transportation expenses | 69,607 | 21,129 | 99,503
Other revenues |  |  |
SALES AND OPERATING REVENUES: |  |  |
Revenues | $ 38,458 | $ 31,816 | $ 48,040

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