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CONSOLIDATED STATEMENTS OF INCOME - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
SALES AND OPERATING REVENUES: |  |  |
Revenues | $ 1,961,720 | $ 2,002,857 | $ 1,796,220
EXPENSES: |  |  |
Operating expenses (excluding depreciation, depletion and amortization) | 1,182,100 | 1,207,713 | 1,091,855
Outside coal purchases | 23,357 | 1,466 |
General and administrative | 72,997 | 68,298 | 61,760
Depreciation, depletion and amortization | 309,075 | 280,225 | 268,981
Settlement gain |  | (80,000) |
Asset impairment | 15,190 | 40,483 |
Total operating expenses | 1,702,222 | 1,630,570 | 1,464,296
INCOME FROM OPERATIONS | 259,498 | 372,287 | 331,924
Interest expense (net of interest capitalized of $1,211, $1,306 and $551, respectively) | (45,875) | (40,218) | (39,385)
Interest income | 379 | 159 | 94
Equity method investment income | 2,203 | 22,189 | 13,860
Equity securities income | 12,906 | 15,696 | 6,398
Acquisition gain | 177,043 |  |
Debt extinguishment loss |  |  | (8,148)
Other income (expense) | 561 | (2,621) | (332)
INCOME BEFORE INCOME TAXES | 406,715 | 367,492 | 304,411
INCOME TAX EXPENSE (BENEFIT) | (211) | 22 | 210
NET INCOME | 406,926 | 367,470 | 304,201
LESS: NET INCOME ATTRIBUTABLE TO NONCONTROLLING INTEREST | (7,512) | (866) | (563)
NET INCOME ATTRIBUTABLE TO ARLP | 399,414 | 366,604 | 303,638
NET INCOME ATTRIBUTABLE TO ARLP |  |  |
GENERAL PARTNER |  | 1,560 | 21,904
LIMITED PARTNERS | $ 399,414 | $ 365,044 | $ 281,734
EARNINGS PER LIMITED PARTNER UNIT - BASIC AND DILUTED | $ 3.07 | $ 2.74 | $ 2.80
WEIGHTED-AVERAGE NUMBER OF UNITS OUTSTANDING - BASIC AND DILUTED | 128,116,670 | 130,758,169 | 98,707,696
Coal sales |  |  |
SALES AND OPERATING REVENUES: |  |  |
Revenues | $ 1,762,442 | $ 1,844,808 | $ 1,711,114
Oil & gas royalties |  |  |
SALES AND OPERATING REVENUES: |  |  |
Revenues | 51,735 |  |
Transportation revenues |  |  |
SALES AND OPERATING REVENUES: |  |  |
Revenues | 99,503 | 112,385 | 41,700
EXPENSES: |  |  |
Transportation expenses | 99,503 | 112,385 | 41,700
Other revenues |  |  |
SALES AND OPERATING REVENUES: |  |  |
Revenues | $ 48,040 | $ 45,664 | $ 43,406

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