Segment Information (Company's Segment Information, Assets) (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Segment Reporting Information [Line Items]
Total assets	$ 16,432,793	$ 15,719,107
Other [Member]
Segment Reporting Information [Line Items]
Total assets	409,864	397,820
Regulated [Member] | Regulated Water [Member]
Segment Reporting Information [Line Items]
Total assets	9,331,307	8,792,633
Regulated [Member] | Regulated Natural Gas [Member]
Segment Reporting Information [Line Items]
Total assets	$ 6,691,622	$ 6,528,654