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Long-Term Debt (Details) - USD ($)		12 Months Ended
	May 24, 2021	Dec. 31, 2021	Dec. 31, 2020	Jul. 08, 2020	Dec. 31, 2013
GSWC
Debt Instrument [Line Items]
Ratio of Indebtedness to Net Capital		0.4288
Ratio of Indebtedness to EBITDA		3.2
GSWC | Maximum
Debt Instrument [Line Items]
Ratio of Indebtedness to Net Capital		0.6667
Ratio of Indebtedness to EBITDA		8
9.56% notes due 2031
Debt Instrument [Line Items]
Interest rate (as a percent)		9.56%	9.56%
9.56% notes due 2031 | GSWC
Debt Instrument [Line Items]
Debt Instrument, Face Amount		$ 28,000,000
Interest rate (as a percent)		9.56%	9.56%
Debt Instrument, Redemption Price, Percentage	3.00%
Redemption Price Of Debt Instrument	$ 840,000
5.87% notes due 2028
Debt Instrument [Line Items]
Interest rate (as a percent)		5.87%	5.87%
5.87% notes due 2028 | GSWC
Debt Instrument [Line Items]
Debt Instrument, Face Amount		$ 40,000,000
Interest rate (as a percent)		5.87%	5.87%
American Recovery and Reinvestment Act Obligation due 2033 | GSWC
Debt Instrument [Line Items]
Interest rate (as a percent)					2.50%
3.45% notes due 2029
Debt Instrument [Line Items]
Interest rate (as a percent)		3.45%	3.45%
3.45% notes due 2029 | GSWC
Debt Instrument [Line Items]
Debt Instrument, Face Amount		$ 15,000,000
Interest rate (as a percent)		3.45%	3.45%
Private Placement Notes [Member] | GSWC
Debt Instrument [Line Items]
Debt Instrument, Face Amount				$ 160,000,000
Debt Instrument Redemption Premium above Treasury Yield		50.00%
2.17% notes due 2030
Debt Instrument [Line Items]
Interest rate (as a percent)		2.17%	2.17%
2.17% notes due 2030 | GSWC
Debt Instrument [Line Items]
Debt Instrument, Face Amount				$ 85,000,000
Interest rate (as a percent)		2.17%	2.17%	2.17%
2.90% notes due 2040
Debt Instrument [Line Items]
Interest rate (as a percent)		2.90%	2.90%
2.90% notes due 2040 | GSWC
Debt Instrument [Line Items]
Debt Instrument, Face Amount				$ 75,000,000
Interest rate (as a percent)		2.90%	2.90%	2.90%

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