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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