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Segment Reporting - Reportable Segment Information (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Segment Reporting Information [Line Items]      
Operating revenue $ 800,590 $ 748,439 $ 670,363
Less:      
Production expenses 311,161 292,022 256,200
Administrative and general 125,998 105,830 98,656
Maintenance 32,895 31,301 25,729
Property taxes and other non-income taxes 37,686 35,928 34,475
Depreciation and amortization 115,323 112,855 105,868
Interest on long-term debt and other interest expense 72,575 71,390 66,144
Provision (benefit) for income taxes 12,355 8,970 5,956
Other (9,981) (3,824) (7,652)
Net income 102,578 93,967 84,987
Capital expenditures 519,753 377,237 312,871
Assets 5,149,566 4,658,309  
Operating Segments | Water Utility Services      
Segment Reporting Information [Line Items]      
Operating revenue 787,099 732,580 652,045
Less:      
Production expenses 305,460 286,763 251,898
Administrative and general 119,665 97,420 93,255
Maintenance 30,124 29,249 23,972
Property taxes and other non-income taxes 37,521 35,223 33,469
Depreciation and amortization 114,286 111,709 104,329
Interest on long-term debt and other interest expense 51,463 47,485 42,743
Provision (benefit) for income taxes 19,928 17,134 11,293
Other (6,531) (920) (4,279)
Net income 115,183 108,517 95,365
Capital expenditures 519,753 377,208 288,627
Assets 5,054,235 4,567,182  
Other Services      
Segment Reporting Information [Line Items]      
Operating revenue 13,491 15,859 18,318
Less:      
Production expenses 5,701 5,259 4,302
Administrative and general 1,306 2,632 2,777
Maintenance 2,771 2,052 1,757
Property taxes and other non-income taxes 47 317 926
Depreciation and amortization 121 253 646
Interest on long-term debt and other interest expense 0 521 329
Provision (benefit) for income taxes 1,371 1,569 2,213
Other (587) 191 (121)
Net income 2,761 3,065 5,489
Capital expenditures 0 29 24,244
Assets 26,707 25,053  
Unallocated Corporate      
Segment Reporting Information [Line Items]      
Operating revenue 0 0 0
Less:      
Production expenses 0 0 0
Administrative and general 5,027 5,778 2,624
Maintenance 0 0 0
Property taxes and other non-income taxes 118 388 80
Depreciation and amortization 916 893 893
Interest on long-term debt and other interest expense 21,112 23,384 23,072
Provision (benefit) for income taxes (8,944) (9,733) (7,550)
Other (2,863) (3,095) (3,252)
Net income (15,366) (17,615) (15,867)
Capital expenditures 0 0 $ 0
Assets $ 68,624 $ 66,074