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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
Revenue:      
Revenue $ 2,551,816 $ 1,949,102 $ 1,696,941
Operating expenses:      
Fuel, purchased power and cost of natural gas sold 1,230,550 741,934 492,404
Operations and maintenance 548,430 501,690 495,404
Depreciation, depletion and amortization 250,909 235,953 224,457
Taxes - property and production 66,683 60,096 56,373
Total operating expenses 2,096,572 1,539,673 1,268,638
Operating income 455,244 409,429 428,303
Other income (expense):      
Interest expense incurred net of amounts capitalized (including amortization of debt issuance costs, premiums and discounts) (162,584) (154,112) (144,931)
Interest income 1,595 1,708 1,461
Impairment of investment 0 0 (6,859)
Other income (expense), net 1,708 1,404 (2,293)
Total other income (expense) (159,281) (151,000) (152,622)
Income before income taxes 295,963 258,429 275,681
Income tax expense (25,205) (7,169) (32,918)
Net income 270,758 251,260 242,763
Net income attributable to non-controlling interest (12,371) (14,516) (15,155)
Net income available for common stock $ 258,387 $ 236,744 $ 227,608
Earnings per share of common stock:      
Earnings per share, Basic (usd per share) $ 3.98 $ 3.74 $ 3.65
Earnings per share, Diluted (usd per share) $ 3.97 $ 3.74 $ 3.65
Weighted average common shares outstanding:      
Basic (in shares) 64,858 63,219 62,378
Diluted (in shares) 65,021 63,325 62,439