v3.26.3
Segment Reporting - Reportable Segment and Other Business Activities (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2026
Jun. 30, 2026
Mar. 31, 2026
Sep. 30, 2025
Jun. 30, 2025
Mar. 31, 2025
Sep. 30, 2026
Sep. 30, 2025
Dec. 31, 2025
Segment Reporting [Line Items]                  
Operating revenue $ 250,229     $ 240,550     $ 643,996 $ 606,404  
Less:                  
Production expenses 103,306     98,320     255,211 238,156  
Administrative and general 35,441     31,306     98,874 87,861  
Maintenance 8,347     8,016     24,178 22,985  
Property taxes and other non-income taxes 10,168     9,516     28,146 27,217  
Depreciation and amortization 32,478     28,765     96,918 85,797  
Interest on long-term debt and other interest expense 18,161     17,898     54,951 54,292  
Provision (benefit) for income taxes 5,202     5,791     12,573 13,932  
Other (5,918)     (4,194)     (15,501) (10,194)  
Net income 43,044 $ 26,589 $ 19,013 45,132 $ 24,675 $ 16,551 88,646 86,358  
Capital expenditures 130,369     153,212     344,813 369,615  
Assets 6,052,124           6,052,124   $ 5,149,566
Operating Segments | Water Utility Services                  
Segment Reporting [Line Items]                  
Operating revenue 245,634     236,222     631,738 596,052  
Less:                  
Production expenses 101,224     96,411     250,631 233,720  
Administrative and general 30,951     30,599     86,608 82,317  
Maintenance 7,333     7,100     20,952 20,848  
Property taxes and other non-income taxes 10,014     9,563     27,975 27,278  
Depreciation and amortization 32,216     28,505     96,132 85,022  
Interest on long-term debt and other interest expense 13,428     12,600     41,425 38,358  
Provision (benefit) for income taxes 6,010     5,743     17,881 17,755  
Other (5,058)     (1,435)     (13,080) (4,305)  
Net income 49,516     47,136     103,214 95,059  
Capital expenditures 130,369     153,212     344,813 369,615  
Assets 5,475,573           5,475,573   5,054,235
Other Services                  
Segment Reporting [Line Items]                  
Operating revenue 4,595     4,328     12,258 10,352  
Less:                  
Production expenses 2,082     1,909     4,580 4,436  
Administrative and general 209     251     627 1,063  
Maintenance 1,014     916     3,226 2,137  
Property taxes and other non-income taxes 50     21     128 (29)  
Depreciation and amortization 31     30     91 91  
Interest on long-term debt and other interest expense 115     0     184 0  
Provision (benefit) for income taxes 135     591     866 1,100  
Other (25)     (370)     (176) (507)  
Net income 984     980     2,732 2,061  
Capital expenditures 0     0     0 0  
Assets 22,177           22,177   26,707
Unallocated Corporate                  
Segment Reporting [Line Items]                  
Operating revenue 0     0     0 0  
Less:                  
Production expenses 0     0     0 0  
Administrative and general 4,281     456     11,639 4,481  
Maintenance 0     0     0 0  
Property taxes and other non-income taxes 104     (68)     43 (32)  
Depreciation and amortization 231     230     695 684  
Interest on long-term debt and other interest expense 4,618     5,298     13,342 15,934  
Provision (benefit) for income taxes (943)     (543)     (6,174) (4,923)  
Other (835)     (2,389)     (2,245) (5,382)  
Net income (7,456)     (2,984)     (17,300) (10,762)  
Capital expenditures 0     $ 0     0 $ 0  
Assets $ 554,374           $ 554,374   $ 68,624