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Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2024 | Mar. 31, 2023
Operating revenues: |  |
Operating revenues: | $ 1,213,825 | $ 1,430,098
Operating expenses: |  |
Total operation and maintenance | 671,917 | 796,545
Purchased natural gas sold | 258,602 | 371,015
Depreciation and amortization | 55,750 | 52,233
Taxes, other than income | 58,992 | 67,428
Electric fuel and purchased power | 32,617 | 24,356
Total operating expenses | 1,077,878 | 1,311,577
Operating income | 135,947 | 118,521
Other income | 13,787 | 10,374
Interest expense | 28,706 | 23,953
Income before income taxes | 121,028 | 104,942
Income taxes | 20,130 | 21,067
Income from continuing operations | 100,898 | 83,875
Discontinued operations, net of tax | 0 | (45,522)
Net income | $ 100,898 | $ 38,353
Earnings per share - basic: |  |
Income from continuing operations (in usd per share) | $ 0.50 | $ 0.41
Discontinued operations, net of tax (in usd per share) | 0 | (0.22)
Earnings per share - basic (in usd per share) | 0.50 | 0.19
Earnings per share - diluted: |  |
Income from continuing operations (in usd per share) | 0.49 | 0.41
Discontinued operations, net of tax (in usd per share) | 0 | (0.22)
Earnings per share - diluted (in usd per share) | $ 0.49 | $ 0.19
Weighted average common shares outstanding - basic (in shares) | 203,779 | 203,624
Weighted average common shares outstanding - diluted (in shares) | 204,187 | 203,910
Regulated operation |  |
Operating revenues: |  |
Operating revenues: | $ 586,017 | $ 673,932
Operating expenses: |  |
Total operation and maintenance | 105,680 | 102,041
Income from continuing operations | 73,343 | 64,464
Nonregulated operation |  |
Operating revenues: |  |
Operating revenues: | 627,808 | 756,166
Operating expenses: |  |
Total operation and maintenance | 566,237 | 694,504
Income from continuing operations | $ 27,555 | $ 19,411

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