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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2024 | Mar. 31, 2023
Income Statement [Abstract] |  |
Operating revenue | $ 270,749 | $ 131,100
Operations: |  |
Water production costs | 64,185 | 55,008
Administrative and general | 35,596 | 35,986
Other operations | 26,925 | 16,604
Maintenance | 8,010 | 7,978
Depreciation and amortization | 32,844 | 29,915
Income tax expense (benefit) | 15,538 | (5,644)
Property and other taxes | 9,757 | 8,777
Total operating expenses | 192,855 | 148,624
Net operating income (loss) | 77,894 | (17,524)
Other income and expenses: |  |
Non-regulated revenue | 5,098 | 4,623
Non-regulated expenses | (1,954) | (2,275)
Other components of net periodic benefit credit | 3,273 | 5,221
Allowance for equity funds used during construction | 1,742 | 1,404
Income tax expense on other income and expenses | (1,321) | (1,794)
Net other income | 6,838 | 7,179
Interest expense: |  |
Interest expense | 15,800 | 12,818
Allowance for borrowed funds used during construction | (758) | (829)
Net interest expense | 15,042 | 11,989
Net income (loss) | 69,690 | (22,334)
Net loss attributable to noncontrolling interests | (227) | (123)
Net income (loss) attributable to California Water Service Group | $ 69,917 | $ (22,211)
Earnings (loss) per share: |  |
Basic (in dollars per share) | $ 1.21 | $ (0.40)
Diluted (in dollars per share) | $ 1.21 | $ (0.40)
Weighted average shares outstanding: |  |
Basic (in shares) | 57,733 | 55,666
Diluted (in shares) | 57,774 | 55,666

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- Definition Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 260 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482662/260-10-50-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 260 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 10 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482689/260-10-45-10 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration