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Condensed Consolidated Statements of Income (unaudited) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Income Statement [Abstract]        
Revenues $ 380,590 $ 346,590 $ 1,386,594 $ 1,210,554
Operating expenses:        
Fuel, purchased power and cost of natural gas sold 94,057 71,686 495,678 331,194
Operations and maintenance 122,277 122,759 375,201 365,533
Depreciation, depletion and amortization 59,159 56,348 174,871 169,413
Taxes - property and production 15,224 13,563 45,390 42,062
Total operating expenses 290,717 264,356 1,091,140 908,202
Operating income 89,873 82,234 295,454 302,352
Other income (expense):        
Interest expense incurred net of amounts capitalized (including amortization of debt issuance costs, premiums and discounts) (38,604) (36,521) (115,098) (108,067)
Interest income 586 480 1,278 1,028
Impairment of investment 0 0 0 (6,859)
Other income (expense), net 1,560 (1,193) 1,635 (703)
Total other income (expense) (36,458) (37,234) (112,185) (114,601)
Income before income taxes 53,415 45,000 183,269 187,751
Income tax (expense) (5,253) (4,651) (6,333) (25,484)
Net income 48,162 40,349 176,936 162,267
Net income attributable to non-controlling interest (4,050) (4,066) (11,347) (11,844)
Net income available for common stock $ 44,112 $ 36,283 $ 165,589 $ 150,423
Earnings per share of common stock:        
Earnings per share, Basic (usd per share) $ 0.70 $ 0.58 $ 2.63 $ 2.41
Earnings per share, Diluted (usd per share) $ 0.70 $ 0.58 $ 2.63 $ 2.41
Weighted average common shares outstanding:        
Basic (in shares) 63,341 62,575 62,950 62,310
Diluted (in shares) 63,436 62,630 63,046 62,362