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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Income Statement [Abstract]    
Operating revenue $ 167,599 $ 149,382
Production Expenses:    
Purchased water 25,953 26,192
Power 3,483 2,427
Groundwater extraction charges 18,291 12,126
Other production expenses 11,240 11,049
Total production expenses 58,967 51,794
Administrative and general 27,760 25,788
Maintenance 7,499 6,687
Property taxes and other non-income taxes 9,195 8,830
Depreciation and amortization 28,282 28,370
Total operating expense 131,703 121,469
Operating income 35,896 27,913
Other (expense) income:    
Interest on long-term debt and other interest expense (18,272) (17,584)
Pension non-service credit 1,603 950
Other, net 795 2,651
Income before income taxes 20,022 13,930
Provision for income taxes 3,471 2,231
Net income 16,551 11,699
Other comprehensive loss, net 0 (442)
Comprehensive income $ 16,551 $ 11,257
Earnings per share    
Basic (in usd per share) $ 0.49 $ 0.36
Diluted (in usd per share) 0.49 0.36
Dividends per share (in usd per share) $ 0.42 $ 0.40
Weighted average shares outstanding    
Basic (in shares) 33,778,792 32,076,720
Diluted (in shares) 33,868,565 32,144,579