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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Income Statement [Abstract]    
Operating revenue $ 149,382 $ 137,296
Production Expenses:    
Purchased water 26,192 22,418
Power 2,427 2,199
Groundwater extraction charges 12,126 10,359
Other production expenses 11,049 12,043
Total production expenses 51,794 47,019
Administrative and general 25,788 24,344
Maintenance 6,687 6,058
Property taxes and other non-income taxes 8,830 8,401
Depreciation and amortization 28,370 26,296
Total operating expense 121,469 112,118
Operating income 27,913 25,178
Other (expense) income:    
Interest on long-term debt and other interest expense (17,584) (15,772)
Pension non-service credit (cost) 950 (64)
Other, net 2,651 3,266
Income before income taxes 13,930 12,608
Provision for income taxes 2,231 1,078
Net income 11,699 11,530
Other comprehensive (loss) income, net (442) 93
Comprehensive income $ 11,257 $ 11,623
Earnings per share    
Basic (in usd per share) $ 0.36 $ 0.37
Diluted (in usd per share) 0.36 0.37
DIVIDENDS PER SHARE (in usd per share) $ 0.40 $ 0.38
Weighted average shares outstanding    
Basic (in shares) 32,076,720 30,936,476
Diluted (in shares) 32,144,579 31,040,897