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CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Thousands, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Income Statement [Abstract] |  |  |
OPERATING REVENUES (Note 2) | $ 3,803,835 | $ 3,586,982 | $ 3,471,209
OPERATING EXPENSES |  |  |
Fuel and purchased power | 1,152,551 | 993,419 | 1,042,237
Operations and maintenance | 954,067 | 958,910 | 941,616
Depreciation and amortization | 650,875 | 614,378 | 590,929
Taxes other than income taxes | 234,639 | 224,835 | 218,579
Other expenses | 6,393 | 7,288 | 5,888
Total | 2,998,525 | 2,798,830 | 2,799,249
OPERATING INCOME | 805,310 | 788,152 | 671,960
OTHER INCOME (DEDUCTIONS) |  |  |
Allowance for equity funds used during construction (Note 1) | 41,737 | 33,776 | 31,431
Pension and other postretirement non-service credits — net (Note 8) | 112,541 | 56,341 | 22,989
Other income (Note 17) | 45,100 | 56,703 | 50,263
Other expense (Note 17) | (25,396) | (57,776) | (17,880)
Total | 173,982 | 89,044 | 86,803
INTEREST EXPENSE |  |  |
Interest charges | 254,314 | 247,501 | 235,251
Allowance for borrowed funds used during construction (Note 1) | (21,052) | (18,530) | (18,528)
Total | 233,262 | 228,971 | 216,723
INCOME BEFORE INCOME TAXES | 746,030 | 648,225 | 542,040
INCOME TAXES (Note 5) | 110,086 | 78,173 | (15,773)
NET INCOME | 635,944 | 570,052 | 557,813
Less: Net income attributable to noncontrolling interests (Note 18) | 17,224 | 19,493 | 19,493
NET INCOME ATTRIBUTABLE TO COMMON SHAREHOLDERS | $ 618,720 | $ 550,559 | $ 538,320
WEIGHTED-AVERAGE COMMON SHARES OUTSTANDING — BASIC (in shares) | 112,910 | 112,666 | 112,443
WEIGHTED-AVERAGE COMMON SHARES OUTSTANDING — DILUTED (in shares) | 113,192 | 112,942 | 112,758
EARNINGS PER WEIGHTED-AVERAGE COMMON SHARE OUTSTANDING |  |  |
Net income attributable to common shareholders - basic (in dollars per share) | $ 5.48 | $ 4.89 | $ 4.79
Net income attributable to common shareholders — diluted (in dollars per share) | $ 5.47 | $ 4.87 | $ 4.77

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