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Long-Term Debt (Details) - USD ($)	12 Months Ended
	Dec. 31, 2020	Jul. 08, 2020	Dec. 31, 2019	Dec. 31, 2014	Dec. 31, 2013
GSWC
Debt Instrument [Line Items]
Ratio of Indebtedness to Net Capital	0.4306
Ratio of Indebtedness to EBITDA	3.1
GSWC | Maximum
Debt Instrument [Line Items]
Ratio of Indebtedness to Net Capital	0.6667
Ratio of Indebtedness to EBITDA	8
Private Placement Notes [Member] | GSWC
Debt Instrument [Line Items]
Interest coverage ratio	4
Private Placement Notes [Member] | GSWC | Minimum
Debt Instrument [Line Items]
Interest coverage ratio	2
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 Premium above Treasury Yield	55.00%
9.56% notes due 2031 | GSWC | Maximum
Debt Instrument [Line Items]
Redemption premium after 2021 (as a percent)	3.00%
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	$ 40,000,000.0
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				$ 15,000,000.0
Interest rate (as a percent)	3.45%		3.45%
Private Placement Notes [Member] | GSWC
Debt Instrument [Line Items]
Debt Instrument, Face Amount		$ 160,000,000.0
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% notes due 2030 | GSWC
Debt Instrument [Line Items]
Debt Instrument, Face Amount		$ 85,000,000.0
Interest rate (as a percent)	2.17%	2.17%
2.90% notes due 2040
Debt Instrument [Line Items]
Interest rate (as a percent)	2.90%
2.90% notes due 2040 | GSWC
Debt Instrument [Line Items]
Debt Instrument, Face Amount		$ 75,000,000.0
Interest rate (as a percent)	2.90%	2.90%

X

- Definition

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+ References

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- Definition

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+ References

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- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=119993939&loc=d3e28551-108399

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400

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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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- Definition

Indebtedness divided by net capital.

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