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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Income Statement [Abstract]        
Operating revenue $ 240,550 $ 225,063 $ 606,404 $ 550,619
Production Expenses:        
Purchased water 38,163 54,310 101,537 118,631
Power 8,175 3,396 15,509 8,560
Groundwater extraction charges 39,608 25,081 84,253 54,759
Other production expenses 12,374 12,919 36,857 36,020
Total production expenses 98,320 95,706 238,156 217,970
Administrative and general 31,306 25,708 87,861 71,964
Maintenance 8,016 8,512 22,985 23,080
Property taxes and other non-income taxes 9,516 9,361 27,217 26,610
Depreciation and amortization 28,765 27,423 85,797 84,159
Total operating expense 175,923 166,710 462,016 423,783
Operating income 64,627 58,353 144,388 126,836
Other (expense) income:        
Interest on long-term debt and other interest expense (17,898) (17,516) (54,292) (53,394)
Pension non-service credit 1,587 940 4,810 2,829
Other, net 2,607 (1,197) 5,384 2,659
Income before income taxes 50,923 40,580 100,290 78,930
Provision for income taxes 5,791 1,928 13,932 7,883
Net income 45,132 38,652 86,358 71,047
Other comprehensive loss, net 0 0 0 (442)
Comprehensive income $ 45,132 $ 38,652 $ 86,358 $ 70,605
Earnings per share        
Basic (in usd per share) $ 1.27 $ 1.17 $ 2.49 $ 2.19
Diluted (in usd per share) 1.27 1.17 2.48 2.18
Dividends per share (in usd per share) $ 0.42 $ 0.40 $ 1.26 $ 1.20
Weighted average shares outstanding        
Basic (in shares) 35,543,224 32,896,967 34,706,183 32,458,666
Diluted (in shares) 35,643,826 32,982,580 34,797,374 32,530,954