Segment Information (Company's Segment Information, Assets) (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Segment Reporting Information [Line Items]
Total assets	$ 14,877,023	$ 14,658,278
Other [Member]
Segment Reporting Information [Line Items]
Total assets	298,664	294,090
Regulated [Member] | Water [Member]
Segment Reporting Information [Line Items]
Total assets	8,487,684	8,403,586
Regulated [Member] | Natural Gas [Member]
Segment Reporting Information [Line Items]
Total assets	$ 6,090,675	$ 5,960,602