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Condensed Consolidated Statements of Income (unaudited) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Income Statement [Abstract]        
Revenues $ 474,195 $ 372,572 $ 1,297,765 $ 1,006,004
Operating expenses:        
Fuel, purchased power and cost of natural gas sold 188,171 108,474 625,097 401,621
Operations and maintenance 132,968 123,245 269,100 252,924
Depreciation, depletion and amortization 64,128 58,443 124,591 115,712
Taxes - property and production 16,539 15,144 33,235 30,166
Total operating expenses 401,806 305,306 1,052,023 800,423
Operating income 72,389 67,266 245,742 205,581
Other income (expense):        
Interest expense incurred net of amounts capitalized (including amortization of debt issuance costs, premiums and discounts) (39,053) (38,669) (77,874) (76,494)
Interest income 289 467 565 692
Other income (expense), net 1,563 (191) 2,267 75
Total other income (expense) (37,201) (38,393) (75,042) (75,727)
Income before income taxes 35,188 28,873 170,700 129,854
Income tax benefit (expense) 658 (586) (13,830) (1,080)
Net income 35,846 28,287 156,870 128,774
Net income attributable to non-controlling interest (2,431) (3,126) (5,929) (7,297)
Net income available for common stock $ 33,415 $ 25,161 $ 150,941 $ 121,477
Earnings per share of common stock:        
Earnings per share, Basic (usd per share) $ 0.52 $ 0.40 $ 2.33 $ 1.94
Earnings per share, Diluted (usd per share) $ 0.52 $ 0.40 $ 2.33 $ 1.93
Weighted average common shares outstanding:        
Basic (in shares) 64,721 62,867 64,643 62,751
Diluted (in shares) 64,883 62,918 64,822 62,817