Long-Term Debt 2 (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Jun. 15, 2023	Jan. 13, 2023	Dec. 31, 2022	Apr. 28, 2022
Annual maturities of all long-term debt, including capitalized leases
2024	$ 353
2025	370
2026	8,116
2027	403
2028	55,421
Thereafter	514,384
Total	579,047			$ 450,373
4.548% note due 2032
Annual maturities of all long-term debt, including capitalized leases
Total	17,500			17,500
4.949% note due 2037
Annual maturities of all long-term debt, including capitalized leases
Total	17,500			17,500
GSWC
Annual maturities of all long-term debt, including capitalized leases
Total	544,047			$ 415,373
Debt Instrument, Face Amount	$ 130,000
GSWC | Series A Senior Notes 5.22 Percent Due 2038
Annual maturities of all long-term debt, including capitalized leases
Debt Instrument, Face Amount			$ 30,000
GSWC | Series A Senior Notes 5.12 Percent Due 2033
Annual maturities of all long-term debt, including capitalized leases
Debt Instrument, Face Amount			$ 100,000
BVES
Annual maturities of all long-term debt, including capitalized leases
Debt Instrument, Face Amount		$ 35,000
BVES | 4.548% note due 2032
Annual maturities of all long-term debt, including capitalized leases
Debt Instrument, Face Amount					$ 17,500
BVES | 4.949% note due 2037
Annual maturities of all long-term debt, including capitalized leases
Debt Instrument, Face Amount					$ 17,500