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CONSOLIDATED STATEMENTS OF INCOME - USD ($)
shares in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Income Statement [Abstract]      
OPERATING REVENUES (Note 2) $ 4,324,385 $ 3,803,835 $ 3,586,982
OPERATING EXPENSES      
Fuel and purchased power 1,629,343 1,152,551 993,419
Operations and maintenance 987,072 954,067 958,910
Depreciation and amortization 753,195 650,875 614,378
Taxes other than income taxes 220,370 234,639 224,835
Other expenses 2,494 6,393 7,288
Total 3,592,474 2,998,525 2,798,830
OPERATING INCOME 731,911 805,310 788,152
OTHER INCOME (DEDUCTIONS)      
Allowance for equity funds used during construction (Note 1) 45,263 41,737 33,776
Pension and other postretirement non-service credits — net (Note 7) 98,487 112,541 56,341
Other income (Note 16) 7,916 45,100 56,703
Other expense (Note 16) (52,385) (25,396) (57,776)
Total 99,281 173,982 89,044
INTEREST EXPENSE      
Interest charges 283,569 254,314 247,501
Allowance for borrowed funds used during construction (Note 1) (28,030) (21,052) (18,530)
Total 255,539 233,262 228,971
INCOME BEFORE INCOME TAXES 575,653 746,030 648,225
INCOME TAXES (Note 4) 74,827 110,086 78,173
NET INCOME 500,826 635,944 570,052
Less: Net income attributable to noncontrolling interests (Note 17) 17,224 17,224 19,493
NET INCOME ATTRIBUTABLE TO COMMON SHAREHOLDERS $ 483,602 $ 618,720 $ 550,559
WEIGHTED-AVERAGE COMMON SHARES OUTSTANDING — BASIC (in shares) 113,196 112,910 112,666
WEIGHTED-AVERAGE COMMON SHARES OUTSTANDING — DILUTED (in shares) 113,416 113,192 112,942
EARNINGS PER WEIGHTED-AVERAGE COMMON SHARE OUTSTANDING      
Net income attributable to common shareholders - basic (in dollars per share) $ 4.27 $ 5.48 $ 4.89
Net income attributable to common shareholders — diluted (in dollars per share) $ 4.26 $ 5.47 $ 4.87