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Segment Reporting (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Segment Reporting Information [Line Items]      
Operating revenue $ 748,439 $ 670,363 $ 620,698
Less:      
Production expenses 292,022 256,200 232,790
Administrative and general 105,830 98,656 95,404
Maintenance 31,301 25,729 30,734
Property taxes and other non-income taxes 35,928 34,475 32,572
Depreciation and amortization 112,855 105,868 104,417
Interest on long-term debt and other interest expense 71,390 66,144 58,062
(Gain) loss on sale of nonutility property 0 0 (6,197)
Provision (benefit) for income taxes 8,970 5,956 8,496
Other (3,824) (7,652) (9,408)
Net income 93,967 84,987 73,828
Capital expenditures 377,237 312,871 242,350
Assets 4,658,309 4,345,067  
Operating Segments | Water Utility Services      
Segment Reporting Information [Line Items]      
Operating revenue 732,580 652,045 603,000
Less:      
Production expenses 286,763 251,898 228,806
Administrative and general 97,420 93,255 90,874
Maintenance 29,249 23,972 29,063
Property taxes and other non-income taxes 35,223 33,469 31,184
Depreciation and amortization 111,709 104,329 99,412
Interest on long-term debt and other interest expense 47,485 42,743 37,958
(Gain) loss on sale of nonutility property     (6,197)
Provision (benefit) for income taxes 17,134 11,293 12,756
Other (920) (4,279) (6,524)
Net income 108,517 95,365 85,668
Capital expenditures 377,208 288,627 241,719
Assets 4,567,182 4,199,610  
Other Services      
Segment Reporting Information [Line Items]      
Operating revenue 15,859 18,318 17,698
Less:      
Production expenses 5,259 4,302 3,984
Administrative and general 2,632 2,777 2,565
Maintenance 2,052 1,757 1,671
Property taxes and other non-income taxes 317 926 923
Depreciation and amortization 253 646 4,112
Interest on long-term debt and other interest expense 521 329 0
(Gain) loss on sale of nonutility property     0
Provision (benefit) for income taxes 1,569 2,213 1,161
Other 191 (121) (52)
Net income 3,065 5,489 3,334
Capital expenditures 29 24,244 631
Assets 25,053 87,316  
Unallocated Corporate      
Segment Reporting Information [Line Items]      
Operating revenue 0 0 0
Less:      
Production expenses 0 0 0
Administrative and general 5,778 2,624 1,965
Maintenance 0 0 0
Property taxes and other non-income taxes 388 80 465
Depreciation and amortization 893 893 893
Interest on long-term debt and other interest expense 23,384 23,072 20,104
(Gain) loss on sale of nonutility property     0
Provision (benefit) for income taxes (9,733) (7,550) (5,421)
Other (3,095) (3,252) (2,832)
Net income (17,615) (15,867) (15,174)
Capital expenditures 0 0 $ 0
Assets $ 66,074 $ 58,141