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Consolidated Statements of Income - USD ($)
shares in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Revenue:      
Revenue $ 1,754,268 $ 1,680,266 $ 1,538,916
Operating expenses:      
Fuel, purchased power and cost of natural gas sold 625,610 563,288 499,132
Operations and maintenance 481,706 454,605 426,603
Depreciation, depletion and amortization 196,328 188,246 175,533
Taxes - property and production 51,746 51,578 46,160
Other operating expenses 1,841 5,813 55,307
Total operating expenses 1,357,231 1,263,530 1,202,735
Operating income 397,037 416,736 336,181
Interest charges -      
Interest expense incurred net of amounts capitalized (including amortization of debt issuance costs, premiums and discounts) (143,720) (140,533) (139,091)
Allowance for funds used during construction - borrowed 2,104 2,415 2,981
Interest income 1,641 1,016 1,429
Allowance for funds used during construction - equity 619 2,321 3,270
Other income (expense), net (1,799) (213) 1,124
Total other income (expense) (141,155) (134,994) (130,287)
Income before income taxes 255,882 281,742 205,894
Income tax benefit (expense) 23,667 (73,367) (59,101)
Income from continuing operations 279,549 208,375 146,793
Net (loss) from discontinued operations (6,887) (17,099) (64,162)
Net income 272,662 191,276 82,631
Net income attributable to noncontrolling interest (14,220) (14,242) (9,661)
Net income (loss) available for common stock 258,442 177,034 72,970
Amounts attributable to common shareholders:      
Net income from continuing operations 265,329 194,133 137,132
Net (loss) from discontinued operations (6,887) (17,099) (64,162)
Net income (loss) available for common stock $ 258,442 $ 177,034 $ 72,970
Earnings (loss) per share of common stock, Basic -      
Earnings from continuing operations, Basic (usd per share) $ 4.88 $ 3.65 $ 2.64
(Loss) from discontinued operations per share, Basic (usd per share) (0.13) (0.32) (1.23)
Total earnings (loss) per share of common stock, Basic (usd per share) 4.75 3.33 1.41
Earnings (loss) per share of common stock, Diluted -      
Earnings from continuing operations, Diluted (usd per share) 4.78 3.52 2.57
(Loss) from discontinued operations, Diluted (usd per share) (0.12) (0.31) (1.20)
Total earnings (loss) per share of common stock, Diluted (usd per share) $ 4.66 $ 3.21 $ 1.37
Weighted average common shares outstanding:      
Basic 54,420 53,221 51,922
Diluted 55,486 55,120 53,271