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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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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 87 -Paragraph 264 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph j -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 30 -Glossary Expected Long-Term Rate of Return on Plan Assets -URI http://asc.fasb.org/extlink&oid=6512013 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(3) -URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920 + Details
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