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Consolidated Statements of Income - USD ($)
shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Revenue:      
Revenue $ 1,696,941 $ 1,734,900 $ 1,754,268
Operating expenses:      
Fuel, purchased power and cost of natural gas sold 492,404 570,829 625,610
Operations and maintenance 495,404 495,994 481,706
Depreciation, depletion and amortization 224,457 209,120 196,328
Taxes - property and production 56,373 52,915 51,746
Other operating expenses 0 0 1,841
Total operating expenses 1,268,638 1,328,858 1,357,231
Operating income 428,303 406,042 397,037
Other income (expense):      
Interest expense incurred net of amounts capitalized (including amortization of debt issuance costs, premiums and discounts) (144,931) (139,291) (141,616)
Interest income 1,461 1,632 1,641
Impairment of investment (6,859) (19,741) 0
Other income (expense), net (2,293) (5,740) (1,180)
Total other income (expense) (152,622) (163,140) (141,155)
Income before income taxes 275,681 242,902 255,882
Income tax benefit (expense) (32,918) (29,580) 23,667
Income from continuing operations 242,763 213,322 279,549
Net (loss) from discontinued operations 0 0 (6,887)
Net income 242,763 213,322 272,662
Net income attributable to noncontrolling interest (15,155) (14,012) (14,220)
Net income available for common stock 227,608 199,310 258,442
Amounts attributable to common shareholders:      
Net income from continuing operations 227,608 199,310 265,329
Net (loss) from discontinued operations 0 0 (6,887)
Net income available for common stock $ 227,608 $ 199,310 $ 258,442
Earnings (loss) per share of common stock, Basic -      
Earnings from continuing operations, Basic (usd per share) $ 3.65 $ 3.29 $ 4.88
(Loss) from discontinued operations, Basic (usd per share) 0 0 (0.13)
Total earnings per share of common stock, Basic (usd per share) 3.65 3.29 4.75
Earnings (loss) per share of common stock, Diluted -      
Earnings from continuing operations, Diluted (usd per share) 3.65 3.28 4.78
(Loss) from discontinued operations, Diluted (usd per share) 0 0 (0.12)
Total earnings per share of common stock, Diluted (usd per share) $ 3.65 $ 3.28 $ 4.66
Weighted average common shares outstanding:      
Basic (in shares) 62,378 60,662 54,420
Diluted (in shares) 62,439 60,798 55,486