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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