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Employee Benefit Plans (Details 3) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013		Dec. 31, 2012	Dec. 31, 2011
Regulatory Adjustment:
Amount of under-collection included in the two-way pension balancing account		$ (214,000)		$ (11,709,000)	$ (18,748,000)
Healthcare Cost Trend Rate
Initial health care cost for employees under age of 65 (as a percent)		7.80%		8.00%	8.00%
Ultimate health care cost for employees under age of 65 (as a percent)		6.30%		7.20%	6.50%
Period within which rate reaches ultimate trend rate		10 years		10 years	10 years
Initial Health care cost for employees of age 65 and over (as a percent)		7.00%		7.00%	7.00%
Ultimate health care cost for employees of age 65 and over (as a percent)		5.70%		5.80%	5.80%
Effects of one-percentage-point change in assumed health care cost trend rates
Effect on total of service and interest cost components -1 Percentage Point Increase		99,000
Effect on total of service and interest cost components -1 Percentage Point Decrease		(85,000)
Effect on post-retirement benefit obligation -1 Percentage Point Increase		1,243,000
Effect on post-retirement benefit obligation -1 Percentage Point Decrease		(1,083,000)
Defined contribution plan
Employer's contribution		1,900,000
Fixed income securities | Maximum
Employer's contribution and fair value of plan assets
Maturity period of investments		20 years
Fixed income securities | Minimum
Employer's contribution and fair value of plan assets
Maturity period of investments		1 year
GSWC
Regulatory Adjustment:
Amount of under-collection included in the two-way pension balancing account		(214,000)		(11,709,000)	(18,748,000)
Pension Benefits
Regulatory Adjustment:
Amount of under-collection included in the two-way pension balancing account		1,920,000		2,305,000	209,000
Actual and Target Asset Allocations
Actual Asset Allocations, Total (as a percent)		100.00%		100.00%
Target Asset Allocation for 2013, Total (as a percent)	100.00%
Employer's contribution and fair value of plan assets
Total investments measured at fair value		127,534,000		107,638,000	92,910,000
Employer contributions		6,556,000		6,117,000
Expected employer's contribution in 2013	6,300,000
Estimated future benefit payments
2014		4,971,000
2015		5,447,000
2016		5,929,000
2017		6,513,000
2018		7,094,000
Thereafter		45,594,000
Total		75,548,000
Expected long-term return on plan assets (as a percentage)		7.00%		7.00%	7.00%
Defined contribution plan
Employer's contribution		394,000		254,000
Pension Benefits | Level 1
Employer's contribution and fair value of plan assets
Total investments measured at fair value		127,534,000		107,638,000
Pension Benefits | Level 2
Employer's contribution and fair value of plan assets
Total investments measured at fair value		0		0
Pension Benefits | Level 3
Employer's contribution and fair value of plan assets
Total investments measured at fair value		0		0
Pension Benefits | Total
Employer's contribution and fair value of plan assets
Total investments measured at fair value		127,534,000		107,638,000
Pension Benefits | Cash equivalents
Actual and Target Asset Allocations
Actual Asset Allocations, Total (as a percent)		2.00%		1.00%
Pension Benefits | Cash equivalents | Level 1
Employer's contribution and fair value of plan assets
Total investments measured at fair value		2,096,000		1,721,000
Pension Benefits | Cash equivalents | Level 2
Employer's contribution and fair value of plan assets
Total investments measured at fair value		0		0
Pension Benefits | Cash equivalents | Level 3
Employer's contribution and fair value of plan assets
Total investments measured at fair value		0		0
Pension Benefits | Cash equivalents | Total
Employer's contribution and fair value of plan assets
Total investments measured at fair value		2,096,000		1,721,000
Pension Benefits | Fixed income securities | Level 1
Employer's contribution and fair value of plan assets
Total investments measured at fair value		47,627,000		41,590,000
Pension Benefits | Fixed income securities | Level 2
Employer's contribution and fair value of plan assets
Total investments measured at fair value		0		0
Pension Benefits | Fixed income securities | Level 3
Employer's contribution and fair value of plan assets
Total investments measured at fair value		0		0
Pension Benefits | Fixed income securities | Total
Employer's contribution and fair value of plan assets
Total investments measured at fair value		47,627,000		41,590,000
Pension Benefits | Equity securities
Actual and Target Asset Allocations
Actual Asset Allocations, Total (as a percent)		61.00%		60.00%
Target Asset Allocation for 2013, Total (as a percent)	60.00%
Pension Benefits | Equity securities | Level 1
Employer's contribution and fair value of plan assets
Total investments measured at fair value		77,811,000		64,327,000
Pension Benefits | Equity securities | Level 2
Employer's contribution and fair value of plan assets
Total investments measured at fair value		0		0
Pension Benefits | Equity securities | Level 3
Employer's contribution and fair value of plan assets
Total investments measured at fair value		0		0
Pension Benefits | Equity securities | Total
Employer's contribution and fair value of plan assets
Total investments measured at fair value		77,811,000		64,327,000
Pension Benefits | U.S. small cap stocks | Level 1
Employer's contribution and fair value of plan assets
Total investments measured at fair value		6,576,000		5,396,000
Pension Benefits | U.S. small cap stocks | Level 2
Employer's contribution and fair value of plan assets
Total investments measured at fair value		0		0
Pension Benefits | U.S. small cap stocks | Level 3
Employer's contribution and fair value of plan assets
Total investments measured at fair value		0		0
Pension Benefits | U.S. small cap stocks | Total
Employer's contribution and fair value of plan assets
Total investments measured at fair value		6,576,000		5,396,000
Pension Benefits | U.S. mid cap stocks | Level 1
Employer's contribution and fair value of plan assets
Total investments measured at fair value		13,119,000		10,722,000
Pension Benefits | U.S. mid cap stocks | Level 2
Employer's contribution and fair value of plan assets
Total investments measured at fair value		0		0
Pension Benefits | U.S. mid cap stocks | Level 3
Employer's contribution and fair value of plan assets
Total investments measured at fair value		0		0
Pension Benefits | U.S. mid cap stocks | Total
Employer's contribution and fair value of plan assets
Total investments measured at fair value		13,119,000		10,722,000
Pension Benefits | U.S. large cap stocks | Level 1
Employer's contribution and fair value of plan assets
Total investments measured at fair value		39,280,000		31,966,000
Pension Benefits | U.S. large cap stocks | Level 2
Employer's contribution and fair value of plan assets
Total investments measured at fair value		0		0
Pension Benefits | U.S. large cap stocks | Level 3
Employer's contribution and fair value of plan assets
Total investments measured at fair value		0		0
Pension Benefits | U.S. large cap stocks | Total
Employer's contribution and fair value of plan assets
Total investments measured at fair value		39,280,000		31,966,000
Pension Benefits | International funds | Level 1
Employer's contribution and fair value of plan assets
Total investments measured at fair value		12,501,000		10,797,000
Pension Benefits | International funds | Level 2
Employer's contribution and fair value of plan assets
Total investments measured at fair value		0		0
Pension Benefits | International funds | Level 3
Employer's contribution and fair value of plan assets
Total investments measured at fair value		0		0
Pension Benefits | International funds | Total
Employer's contribution and fair value of plan assets
Total investments measured at fair value		12,501,000		10,797,000
Pension Benefits | Real estate funds | Level 1
Employer's contribution and fair value of plan assets
Total investments measured at fair value		6,335,000		5,446,000
Pension Benefits | Real estate funds | Level 2
Employer's contribution and fair value of plan assets
Total investments measured at fair value		0		0
Pension Benefits | Real estate funds | Level 3
Employer's contribution and fair value of plan assets
Total investments measured at fair value		0		0
Pension Benefits | Real estate funds | Total
Employer's contribution and fair value of plan assets
Total investments measured at fair value		6,335,000		5,446,000
Pension Benefits | Debt securities
Actual and Target Asset Allocations
Actual Asset Allocations, Total (as a percent)		37.00%		39.00%
Target Asset Allocation for 2013, Total (as a percent)	40.00%
Pension Benefits | GSWC
Regulatory Adjustment:
Number of water regions for which two-way balancing account was established		3
Amount of under-collection included in the two-way pension balancing account		(1,900,000)		(2,300,000)	(200,000)
Post-Retirement Medical Plans
Regulatory Adjustment:
Amount of under-collection included in the two-way pension balancing account		0		0	0
Actual and Target Asset Allocations
Actual Asset Allocations, Total (as a percent)		100.00%		100.00%
Target Asset Allocation for 2013, Total (as a percent)	100.00%
Employer's contribution and fair value of plan assets
Total investments measured at fair value		9,873,000		8,359,000	7,916,000
Employer contributions		608,000		155,000
Estimated future benefit payments
2014		483,000
2015		558,000
2016		630,000
2017		713,000
2018		814,000
Thereafter		5,057,000
Total		8,255,000
Post-Retirement Medical Plans | Level 1
Employer's contribution and fair value of plan assets
Total investments measured at fair value		9,873,000		8,359,000
Post-Retirement Medical Plans | Level 2
Employer's contribution and fair value of plan assets
Total investments measured at fair value		0		0
Post-Retirement Medical Plans | Level 3
Employer's contribution and fair value of plan assets
Total investments measured at fair value		0		0
Post-Retirement Medical Plans | Total
Employer's contribution and fair value of plan assets
Total investments measured at fair value		9,873,000		8,359,000
Post-Retirement Medical Plans | Cash equivalents
Actual and Target Asset Allocations
Actual Asset Allocations, Total (as a percent)		1.00%		1.00%
Post-Retirement Medical Plans | Cash equivalents | Level 1
Employer's contribution and fair value of plan assets
Total investments measured at fair value		142,000		65,000
Post-Retirement Medical Plans | Cash equivalents | Level 2
Employer's contribution and fair value of plan assets
Total investments measured at fair value		0		0
Post-Retirement Medical Plans | Cash equivalents | Level 3
Employer's contribution and fair value of plan assets
Total investments measured at fair value		0		0
Post-Retirement Medical Plans | Cash equivalents | Total
Employer's contribution and fair value of plan assets
Total investments measured at fair value		142,000		65,000
Post-Retirement Medical Plans | Fixed income securities | Level 1
Employer's contribution and fair value of plan assets
Total investments measured at fair value		3,731,000		3,192,000
Post-Retirement Medical Plans | Fixed income securities | Level 2
Employer's contribution and fair value of plan assets
Total investments measured at fair value		0		0
Post-Retirement Medical Plans | Fixed income securities | Level 3
Employer's contribution and fair value of plan assets
Total investments measured at fair value		0		0
Post-Retirement Medical Plans | Fixed income securities | Total
Employer's contribution and fair value of plan assets
Total investments measured at fair value		3,731,000		3,192,000
Post-Retirement Medical Plans | Equity securities
Actual and Target Asset Allocations
Actual Asset Allocations, Total (as a percent)		61.00%		61.00%
Target Asset Allocation for 2013, Total (as a percent)	100.00%
Post-Retirement Medical Plans | U.S. large cap stocks | Level 1
Employer's contribution and fair value of plan assets
Total investments measured at fair value		6,000,000		5,102,000
Post-Retirement Medical Plans | U.S. large cap stocks | Level 2
Employer's contribution and fair value of plan assets
Total investments measured at fair value		0		0
Post-Retirement Medical Plans | U.S. large cap stocks | Level 3
Employer's contribution and fair value of plan assets
Total investments measured at fair value		0		0
Post-Retirement Medical Plans | U.S. large cap stocks | Total
Employer's contribution and fair value of plan assets
Total investments measured at fair value		6,000,000		5,102,000
Post-Retirement Medical Plans | Debt securities
Actual and Target Asset Allocations
Actual Asset Allocations, Total (as a percent)		38.00%		38.00%
Target Asset Allocation for 2013, Total (as a percent)	40.00%
Union plan
Estimated future benefit payments
Expected long-term return on plan assets (as a percentage)		7.00%	[1]	7.00%	7.00%
Non-union plan
Estimated future benefit payments
Expected long-term return on plan assets (as a percentage)		4.20%	[1]	4.20%	4.20%
SERP
Employer's contribution and fair value of plan assets
Total investments measured at fair value		0		0
Estimated future benefit payments
2014		230,000
2015		383,000
2016		394,000
2017		466,000
2018		570,000
Thereafter		4,115,000
Total		6,158,000
Balance in Rabbi Trust
Balance in Rabbi Trust		6,800,000
SERP | Rabbi Trust | Level 1
Employer's contribution and fair value of plan assets
Total investments measured at fair value		6,816,000		4,816,000
SERP | Rabbi Trust | Level 2
Employer's contribution and fair value of plan assets
Total investments measured at fair value		0		0
SERP | Rabbi Trust | Level 3
Employer's contribution and fair value of plan assets
Total investments measured at fair value		0		0
SERP | Rabbi Trust | Total
Employer's contribution and fair value of plan assets
Total investments measured at fair value		6,816,000		4,816,000
SERP | Rabbi Trust | Cash equivalents | Level 1
Employer's contribution and fair value of plan assets
Total investments measured at fair value		27,000		116,000
SERP | Rabbi Trust | Cash equivalents | Level 2
Employer's contribution and fair value of plan assets
Total investments measured at fair value		0		0
SERP | Rabbi Trust | Cash equivalents | Level 3
Employer's contribution and fair value of plan assets
Total investments measured at fair value		0		0
SERP | Rabbi Trust | Cash equivalents | Total
Employer's contribution and fair value of plan assets
Total investments measured at fair value		27,000		116,000
SERP | Rabbi Trust | Fixed income securities | Level 1
Employer's contribution and fair value of plan assets
Total investments measured at fair value		2,587,000		1,878,000
SERP | Rabbi Trust | Fixed income securities | Level 2
Employer's contribution and fair value of plan assets
Total investments measured at fair value		0		0
SERP | Rabbi Trust | Fixed income securities | Level 3
Employer's contribution and fair value of plan assets
Total investments measured at fair value		0		0
SERP | Rabbi Trust | Fixed income securities | Total
Employer's contribution and fair value of plan assets
Total investments measured at fair value		2,587,000		1,878,000
SERP | Rabbi Trust | Equity securities | Level 1
Employer's contribution and fair value of plan assets
Total investments measured at fair value		4,202,000		2,822,000
SERP | Rabbi Trust | Equity securities | Level 2
Employer's contribution and fair value of plan assets
Total investments measured at fair value		0		0
SERP | Rabbi Trust | Equity securities | Level 3
Employer's contribution and fair value of plan assets
Total investments measured at fair value		0		0
SERP | Rabbi Trust | Equity securities | Total
Employer's contribution and fair value of plan assets
Total investments measured at fair value		4,202,000		2,822,000
Pension and other post-retirement obligations | GSWC
Regulatory Adjustment:
Number of water regions for which two-way balancing account was established		3
Regulatory asset authorized under settlement		15,200,000
Pension and other post-retirement obligations | Two-way pension balancing account | GSWC
Regulatory Adjustment:
Regulatory asset authorized under settlement		$ 5,100,000
[1] *7.0% for union plan, 4.2% for non-union, net of income taxes in 2013, 2012 and 2011.

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The ultimate trend rate for health care costs for employees of age sixty-five and over.

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An assumption as to the rate of return on plan assets reflecting the average rate of earnings expected on the funds invested or to be invested to provide for the benefits included in the benefit obligation.

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The increase in the fair value of plan assets from contributions made by the employer.

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Amount of effect of a one-percentage-point decrease in the assumed health care cost trend rates on the accumulated postretirement benefit obligation for health care benefits.

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Amount of effect of a one-percentage-point decrease in the assumed health care cost trend rates on the aggregate of the service and interest cost components of net periodic postretirement health care benefit costs.

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The effect of a one-percentage-point increase in the assumed health care cost trend rates on the accumulated postretirement benefit obligation for health care benefits.

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The employer's best estimate, as soon as it can be reasonably determined, of contributions expected to be paid to the plan during the next fiscal year beginning after the date of the latest statement of financial position. Estimated contributions may be presented in the aggregate combining (1) contributions required by funding regulations or laws, (2) discretionary contributions, and (3) noncash contributions.

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