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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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