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Segment Reporting - Reportable Segment and Other Business Activities (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Dec. 31, 2024
Segment Reporting Information [Line Items]      
Operating revenue $ 167,599 $ 149,382  
Less:      
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  
Interest on long-term debt and other interest expense 18,272 17,584  
Provision (benefit) for income taxes 3,471 2,231  
Other (2,398) (3,601)  
Net income 16,551 11,699  
Capital expenditures 84,345 73,511  
Assets 4,728,810   $ 4,658,309
Operating Segments | Water Utility Services      
Segment Reporting Information [Line Items]      
Operating revenue 165,156 144,915  
Less:      
Production expenses 57,985 51,037  
Administrative and general 26,751 23,850  
Maintenance 7,003 6,243  
Property taxes and other non-income taxes 9,209 8,590  
Depreciation and amortization 28,032 28,061  
Interest on long-term debt and other interest expense 13,039 11,542  
Provision (benefit) for income taxes 5,306 3,696  
Other (1,122) (2,885)  
Net income 18,953 14,781  
Capital expenditures 84,345 73,511  
Assets 4,633,239   4,567,182
Other Services      
Segment Reporting Information [Line Items]      
Operating revenue 2,443 4,467  
Less:      
Production expenses 982 758  
Administrative and general 560 810  
Maintenance 496 444  
Property taxes and other non-income taxes (59) 238  
Depreciation and amortization 27 86  
Interest on long-term debt and other interest expense 0 221  
Provision (benefit) for income taxes 226 584  
Other (99) (8)  
Net income 310 1,334  
Capital expenditures 0 0  
Assets 27,841   25,053
Unallocated Corporate      
Segment Reporting Information [Line Items]      
Operating revenue 0 0  
Less:      
Production expenses 0 (1)  
Administrative and general 449 1,128  
Maintenance 0 0  
Property taxes and other non-income taxes 45 2  
Depreciation and amortization 223 223  
Interest on long-term debt and other interest expense 5,233 5,821  
Provision (benefit) for income taxes (2,061) (2,049)  
Other (1,177) (708)  
Net income (2,712) (4,416)  
Capital expenditures 0 $ 0  
Assets $ 67,730   $ 66,074