Segment Reporting - Reportable Segment and Other Business Activities (Details) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2025	Mar. 31, 2025	Jun. 30, 2024	Mar. 31, 2024	Jun. 30, 2025	Jun. 30, 2024	Dec. 31, 2024
Segment Reporting Information [Line Items]
Operating revenue	$ 198,255		$ 176,174		$ 365,854	$ 325,556
Less:
Production expenses	80,869		70,470		139,836	122,264
Administrative and general	28,795		20,468		56,555	46,256
Maintenance	7,470		7,881		14,969	14,568
Property taxes and other non-income taxes	8,506		8,419		17,701	17,249
Depreciation and amortization	28,750		28,366		57,032	56,736
Interest on long-term debt and other interest expense	18,122		18,294		36,394	35,878
Provision (benefit) for income taxes	4,670		3,724		8,141	5,955
Other	(3,602)		(2,144)		(6,000)	(5,745)
Net income	24,675	$ 16,551	20,696	$ 11,699	41,226	32,395
Capital expenditures	132,058		96,636		216,403	170,147
Assets	4,846,926				4,846,926		$ 4,658,309
Operating Segments | Water Utility Services
Segment Reporting Information [Line Items]
Operating revenue	194,674		172,046		359,830	316,961
Less:
Production expenses	79,324		69,176		137,309	120,213
Administrative and general	24,967		19,292		51,718	43,142
Maintenance	6,745		7,261		13,748	13,504
Property taxes and other non-income taxes	8,506		8,463		17,715	17,053
Depreciation and amortization	28,485		28,057		56,517	56,118
Interest on long-term debt and other interest expense	12,719		12,037		25,758	23,579
Provision (benefit) for income taxes	6,706		5,325		12,012	9,021
Other	(1,748)		(1,570)		(2,870)	(4,455)
Net income	28,970		24,005		47,923	38,786
Capital expenditures	132,058		96,636		216,403	170,147
Assets	4,728,012				4,728,012		4,567,182
Other Services
Segment Reporting Information [Line Items]
Operating revenue	3,581		4,128		6,024	8,595
Less:
Production expenses	1,545		1,293		2,527	2,051
Administrative and general	252		820		812	1,630
Maintenance	725		620		1,221	1,064
Property taxes and other non-income taxes	9		20		(50)	258
Depreciation and amortization	34		86		61	172
Interest on long-term debt and other interest expense	0		224		0	445
Provision (benefit) for income taxes	283		233		509	817
Other	(38)		583		(137)	575
Net income	771		249		1,081	1,583
Capital expenditures	0		0		0	0
Assets	27,994				27,994		25,053
Unallocated Corporate
Segment Reporting Information [Line Items]
Operating revenue	0		0		0	0
Less:
Production expenses	0		1		0	0
Administrative and general	3,576		356		4,025	1,484
Maintenance	0		0		0	0
Property taxes and other non-income taxes	(9)		(64)		36	(62)
Depreciation and amortization	231		223		454	446
Interest on long-term debt and other interest expense	5,403		6,033		10,636	11,854
Provision (benefit) for income taxes	(2,319)		(1,834)		(4,380)	(3,883)
Other	(1,816)		(1,157)		(2,993)	(1,865)
Net income	(5,066)		(3,558)		(7,778)	(7,974)
Capital expenditures	0		$ 0		0	$ 0
Assets	$ 90,920				$ 90,920		$ 66,074