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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - 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] |  |  |  |
Operating revenue | $ 256,723 | $ 304,108 | $ 617,583 | $ 605,155
Operations: |  |  |  |
Water production costs | 84,951 | 85,344 | 214,688 | 210,462
Administrative and general | 30,712 | 29,208 | 92,837 | 85,827
Other operations | 24,686 | 29,746 | 63,318 | 69,618
Maintenance | 7,739 | 7,129 | 21,118 | 20,924
Depreciation and amortization | 27,232 | 24,699 | 81,516 | 73,733
Income taxes | 1,705 | 13,804 | 3,576 | 10,489
Property and other taxes | 8,546 | 8,116 | 24,213 | 22,470
Total operating expenses | 185,571 | 198,046 | 501,266 | 493,523
Net operating income | 71,152 | 106,062 | 116,317 | 111,632
Other income and expenses: |  |  |  |
Non-regulated revenue | 5,813 | 3,934 | 16,759 | 11,969
Non-regulated expenses | (5,779) | (2,865) | (12,354) | (11,811)
Other components of net periodic benefit credit (cost) | 1,853 | (1,008) | 7,520 | (3,770)
Allowance for equity funds used during construction | 898 | 973 | 2,290 | 4,292
Income tax expense on other income and expenses | (207) | (245) | (1,077) | (152)
Net other income | 2,578 | 789 | 13,138 | 528
Interest expense: |  |  |  |
Interest expense | 11,737 | 11,162 | 33,165 | 33,573
Allowance for borrowed funds used during construction | (506) | (671) | (1,253) | (2,747)
Net interest expense | 11,231 | 10,491 | 31,912 | 30,826
Net income | 62,499 | 96,360 | 97,543 | 81,334
Net income attributable to noncontrolling interests | 70 | 0 | (79) | 0
Net income attributable to California Water Service Group | $ 62,429 | $ 96,360 | $ 97,622 | $ 81,334
Earnings per share of common stock: |  |  |  |
Basic (in dollars per share) | $ 1.20 | $ 1.94 | $ 1.91 | $ 1.66
Diluted (in dollars per share) | $ 1.20 | $ 1.94 | $ 1.91 | $ 1.66
Weighted average shares outstanding: |  |  |  |
Basic (in shares) | 51,823 | 49,576 | 51,119 | 49,034
Diluted (in shares) | 51,823 | 49,576 | 51,119 | 49,034

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