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v3.21.1

Condensed Consolidated Statements of Income (unaudited) - USD ($) shares in Thousands, $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2021 | Mar. 31, 2020
Income Statement [Abstract] |  |
Revenues | $ 633,432 | $ 537,050
Operating expenses: |  |
Fuel, purchased power and cost of natural gas sold | 293,147 | 187,879
Operations and maintenance | 129,679 | 125,466
Depreciation, depletion and amortization | 57,269 | 56,402
Taxes - property and production | 15,022 | 14,118
Total operating expenses | 495,117 | 383,865
Operating income | 138,315 | 153,185
Other income (expense): |  |
Interest expense incurred net of amounts capitalized (including amortization of debt issuance costs, premiums and discounts) | (37,825) | (35,781)
Interest income | 225 | 328
Impairment of investment | 0 | (6,859)
Other income (expense), net | 266 | 2,353
Total other income (expense) | (37,334) | (39,959)
Income before income taxes | 100,981 | 113,226
Income tax (expense) | (494) | (16,002)
Net income | 100,487 | 97,224
Net income attributable to noncontrolling interest | (4,171) | (4,050)
Net income available for common stock | $ 96,316 | $ 93,174
Earnings per share of common stock: |  |
Earnings per share, Basic (usd per share) | $ 1.54 | $ 1.51
Earnings per share, Diluted (usd per share) | $ 1.54 | $ 1.51
Weighted average common shares outstanding: |  |
Basic (in shares) | 62,633 | 61,778
Diluted (in shares) | 62,691 | 61,856

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