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Consolidated Statements of Income - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Operating revenues:        
Operating revenues: $ 1,423,657 $ 1,362,928 $ 2,651,595 $ 2,560,302
Operating expenses:        
Operation and maintenance: 1,077,796 1,029,171 1,889,454 1,850,171
Purchased natural gas sold 63,213 56,844 239,450 222,256
Depreciation, depletion and amortization 73,661 71,508 147,384 140,747
Taxes, other than income 53,189 52,584 115,724 116,696
Electric fuel and purchased power 18,109 14,567 36,730 35,107
Total operating expenses 1,285,968 1,224,674 2,428,742 2,364,977
Operating income 137,689 138,254 222,853 195,325
Other income 9,027 10,063 12,381 9,058
Interest expense 23,381 24,818 46,835 49,371
Income before income taxes 123,335 123,499 188,399 155,012
Income taxes 23,164 23,657 36,112 29,631
Income from continuing operations 100,171 99,842 152,287 125,381
Income (loss) from discontinued operations, net of tax 19 (139) 34 (548)
Net income $ 100,190 $ 99,703 $ 152,321 $ 124,833
Earnings per share - basic:        
Income from continuing operations $ 0.50 $ 0.50 $ 0.76 $ 0.62
Discontinued operations, net of tax 0 0 0 0
Earnings per share - basic 0.50 0.50 0.76 0.62
Earnings per share - diluted:        
Income from continuing operations 0.50 0.50 0.76 0.62
Discontinued operations, net of tax 0 0 0 0
Earnings per share - diluted $ 0.50 $ 0.50 $ 0.76 $ 0.62
Weighted average common shares outstanding - basic 201,345 200,522 201,028 200,481
Weighted average common shares outstanding - diluted 201,693 200,539 201,328 200,497
Regulated operation        
Operating revenues:        
Operating revenues: $ 260,568 $ 241,353 $ 702,951 $ 660,035
Operating expenses:        
Operation and maintenance: 89,404 83,103 183,737 170,712
Income from continuing operations 17,686 19,878 73,808 71,007
Nonregulated operation        
Operating revenues:        
Operating revenues: 1,163,089 1,121,575 1,948,644 1,900,267
Operating expenses:        
Operation and maintenance: 988,392 946,068 1,705,717 1,679,459
Income from continuing operations $ 82,485 $ 79,964 $ 78,479 $ 54,374