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Condensed Consolidated Statements of Income (unaudited) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Income Statement [Abstract]    
Revenues $ 633,432 $ 537,050
Operating expenses:    
Fuel, purchased power and cost of natural gas sold 293,147 187,879
Operations and maintenance 129,679 125,466
Depreciation, depletion and amortization 57,269 56,402
Taxes - property and production 15,022 14,118
Total operating expenses 495,117 383,865
Operating income 138,315 153,185
Other income (expense):    
Interest expense incurred net of amounts capitalized (including amortization of debt issuance costs, premiums and discounts) (37,825) (35,781)
Interest income 225 328
Impairment of investment 0 (6,859)
Other income (expense), net 266 2,353
Total other income (expense) (37,334) (39,959)
Income before income taxes 100,981 113,226
Income tax (expense) (494) (16,002)
Net income 100,487 97,224
Net income attributable to noncontrolling interest (4,171) (4,050)
Net income available for common stock $ 96,316 $ 93,174
Earnings per share of common stock:    
Earnings per share, Basic (usd per share) $ 1.54 $ 1.51
Earnings per share, Diluted (usd per share) $ 1.54 $ 1.51
Weighted average common shares outstanding:    
Basic (in shares) 62,633 61,778
Diluted (in shares) 62,691 61,856