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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
Operating revenues:      
Revenues $ 6,973,864 $ 5,680,733 $ 5,532,750
Operating expenses:      
Operation and maintenance: 4,978,857 4,078,623 4,028,262
Purchased natural gas sold 757,883 483,118 390,269
Depreciation, depletion and amortization 327,826 299,214 285,100
Taxes, other than income 243,338 211,454 217,253
Electric fuel and purchased power 92,007 74,105 66,941
Operating expenses 6,399,911 5,146,514 4,987,825
Operating income 573,953 534,219 544,925
Other income 7,379 26,416 26,711
Interest expense 119,273 93,984 96,519
Income before income taxes 462,059 466,651 475,117
Income taxes 94,783 88,920 84,590
Income from continuing operations 367,276 377,731 390,527
Discontinued operations, net of tax 213 400 (322)
Net income $ 367,489 $ 378,131 $ 390,205
Earnings per share - basic:      
Income from continuing operations $ 1.81 $ 1.87 $ 1.95
Discontinued operations, net of tax 0 0 0
Earnings per share - basic 1.81 1.87 1.95
Earnings per share - diluted:      
Income from continuing operations 1.81 1.87 1.95
Discontinued operations, net of tax 0 0 0
Earnings per share - diluted $ 1.81 $ 1.87 $ 1.95
Weighted average common shares outstanding - basic 203,358 202,076 200,502
Weighted Average Number of Shares Outstanding, Diluted 203,462 202,383 200,571
Regulated Operation      
Operating revenues:      
Revenues $ 1,735,759 $ 1,390,343 $ 1,249,146
Operating expenses:      
Operation and maintenance: 374,708 366,586 353,184
Income from continuing operations 137,605 143,085 135,103
Nonregulated Operation      
Operating revenues:      
Revenues 5,238,105 4,290,390 4,283,604
Operating expenses:      
Operation and maintenance: 4,604,149 3,712,037 3,675,078
Income from continuing operations $ 229,671 $ 234,646 $ 255,424