Segment Information (Company's Segment Information, Assets) (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Segment Reporting Information [Line Items]
Total assets	$ 16,101,935	$ 15,719,107
Other [Member]
Segment Reporting Information [Line Items]
Total assets	408,888	397,820
Regulated [Member] | Water [Member]
Segment Reporting Information [Line Items]
Total assets	9,144,894	8,792,633
Regulated [Member] | Natural Gas [Member]
Segment Reporting Information [Line Items]
Total assets	$ 6,548,153	$ 6,528,654