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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Income Statement [Abstract] |  |  |
Operating revenue | $ 748,439 | $ 670,363 | $ 620,698
Production Expenses: |  |  |
Purchased water | 158,568 | 135,982 | 122,334
Power | 11,457 | 9,602 | 8,889
Groundwater extraction charges | 73,146 | 62,980 | 56,158
Other production expenses | 48,851 | 47,636 | 45,409
Total production expenses | 292,022 | 256,200 | 232,790
Administrative and general | 105,830 | 98,656 | 95,404
Maintenance | 31,301 | 25,729 | 30,734
Property taxes and other non-income taxes | 35,928 | 34,475 | 32,572
Depreciation and amortization | 112,855 | 105,868 | 104,417
Gain on sale of nonutility properties | 0 | 0 | (6,197)
Total operating expense | 577,936 | 520,928 | 489,720
Operating income | 170,503 | 149,435 | 130,978
Other (expense) income: |  |  |
Interest on long-term debt and other interest expense | (71,390) | (66,144) | (58,062)
Pension non-service credit (cost) | 3,769 | (1,230) | 5,023
Other, net | 55 | 8,882 | 4,385
Income before income taxes | 102,937 | 90,943 | 82,324
Provision for income taxes | 8,970 | 5,956 | 8,496
Net income | 93,967 | 84,987 | 73,828
Other comprehensive income: |  |  |
Unrealized (loss) gain on investment, net of taxes of $(163) in 2024, $166 in 2023 and $(188) in 2022 | (442) | 530 | (511)
Adjustment to pension benefit plans, net of taxes of $0 in 2024, $80 in 2023 and $793 in 2022 | 611 | (216) | 2,151
Comprehensive income | $ 94,136 | $ 85,301 | $ 75,468
Earnings per share |  |  |
—Basic (in dollars per share) | $ 2.87 | $ 2.69 | $ 2.44
—Diluted (in dollars per share) | $ 2.87 | $ 2.68 | $ 2.43
Weighted average shares outstanding |  |  |
—Basic (shares) | 32,701,292 | 31,575,197 | 30,304,557
—Diluted (shares) | 32,779,573 | 31,663,274 | 30,423,735

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