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Segment Reporting - Reportable Segment and Other Business Activities (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Jun. 30, 2025
Mar. 31, 2025
Sep. 30, 2024
Jun. 30, 2024
Mar. 31, 2024
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Segment Reporting Information [Line Items]                  
Operating revenue $ 240,550     $ 225,063     $ 606,404 $ 550,619  
Less:                  
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  
Interest on long-term debt and other interest expense 17,898     17,516     54,292 53,394  
Provision (benefit) for income taxes 5,791     1,928     13,932 7,883  
Other (4,194)     257     (10,194) (5,488)  
Net income 45,132 $ 24,675 $ 16,551 38,652 $ 20,696 $ 11,699 86,358 71,047  
Capital expenditures 153,212     100,885     369,615 271,032  
Assets 5,010,654           5,010,654   $ 4,658,309
Operating Segments | Water Utility Services                  
Segment Reporting Information [Line Items]                  
Operating revenue 236,222     220,938     596,052 537,899  
Less:                  
Production expenses 96,411     93,788     233,720 214,001  
Administrative and general 30,599     23,706     82,317 66,848  
Maintenance 7,100     8,103     20,848 21,607  
Property taxes and other non-income taxes 9,563     9,220     27,278 26,273  
Depreciation and amortization 28,505     27,112     85,022 83,230  
Interest on long-term debt and other interest expense 12,600     11,516     38,358 35,095  
Provision (benefit) for income taxes 5,743     1,182     17,755 10,203  
Other (1,435)     2,493     (4,305) (1,962)  
Net income 47,136     43,818     95,059 82,604  
Capital expenditures 153,212     100,885     369,615 271,032  
Assets 4,930,531           4,930,531   4,567,182
Other Services                  
Segment Reporting Information [Line Items]                  
Operating revenue 4,328     4,125     10,352 12,720  
Less:                  
Production expenses 1,909     1,918     4,436 3,969  
Administrative and general 251     483     1,063 2,113  
Maintenance 916     409     2,137 1,473  
Property taxes and other non-income taxes 21     107     (29) 365  
Depreciation and amortization 30     87     91 259  
Interest on long-term debt and other interest expense 0     75     0 520  
Provision (benefit) for income taxes 591     404     1,100 1,221  
Other (370)     (240)     (507) 335  
Net income 980     882     2,061 2,465  
Capital expenditures 0     0     0 0  
Assets 23,209           23,209   25,053
Unallocated Corporate                  
Segment Reporting Information [Line Items]                  
Operating revenue 0     0     0 0  
Less:                  
Production expenses 0     0     0 0  
Administrative and general 456     1,519     4,481 3,003  
Maintenance 0     0     0 0  
Property taxes and other non-income taxes (68)     34     (32) (28)  
Depreciation and amortization 230     224     684 670  
Interest on long-term debt and other interest expense 5,298     5,925     15,934 17,779  
Provision (benefit) for income taxes (543)     342     (4,923) (3,541)  
Other (2,389)     (1,996)     (5,382) (3,861)  
Net income (2,984)     (6,048)     (10,762) (14,022)  
Capital expenditures 0     $ 0     0 $ 0  
Assets $ 56,914           $ 56,914   $ 66,074