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CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Thousands, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Utility revenues: |  |  |
Utility revenues, exclusive of alternative revenue programs | $ 1,324,091 | $ 1,323,524 | $ 1,368,657
Alternative revenue programs | (3,814) | 9,614 | 908
Total utility revenues | 1,320,277 | 1,333,138 | 1,369,565
Non-utility revenues | 1,614 | 12,484 | 27,328
Total operating revenues | 1,321,891 | 1,345,622 | 1,396,893
Utility operating expenses: |  |  |
Resource costs | 398,509 | 439,817 | 494,736
Other operating expenses | 354,614 | 345,212 | 318,274
Merger transaction costs |  | 19,675 | 3,718
Depreciation and amortization | 223,507 | 205,365 | 182,877
Taxes other than income taxes | 106,501 | 105,652 | 107,295
Non-utility operating expenses: |  |  |
Other operating expenses | 5,344 | 18,883 | 28,081
Depreciation and amortization | 716 | 629 | 799
Total operating expenses | 1,089,191 | 1,135,233 | 1,135,780
Income from operations | 232,700 | 210,389 | 261,113
Interest expense | 104,348 | 103,012 | 99,715
Interest expense to affiliated trusts | 713 | 1,342 | 1,221
Capitalized interest | (4,083) | (4,174) | (3,939)
Merger termination fee |  | (103,000) |
Other expense (income)-net | (4,817) | (14,928) | 1,458
Income before income taxes | 136,539 | 228,137 | 162,658
Income tax expense | 7,051 | 31,374 | 26,060
Net income | 129,488 | 196,763 | 136,598
Net loss (income) attributable to noncontrolling interests |  | 216 | (169)
Net income attributable to Avista Corp. shareholders | $ 129,488 | $ 196,979 | $ 136,429
Weighted-average common shares outstanding (thousands), basic | 67,962 | 66,205 | 65,673
Weighted-average common shares outstanding (thousands), diluted | 68,102 | 66,329 | 65,946
Earnings per common share attributable to Avista Corp. shareholders: |  |  |
Basic | $ 1.91 | $ 2.98 | $ 2.08
Diluted | $ 1.90 | $ 2.97 | $ 2.07

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