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Employee Benefit Plans (Details 3) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Employee benefit plans |  |  |  |
Defined Contribution Plan, Employer Discretionary Contribution Amount | $ 755 |  | $ 568 | $ 394
Estimated future benefit payments |  |  |  |
Increase (Decrease) in Pension and Postretirement Obligations | $ 616 |  | (2,356) | 4,396
Healthcare Cost Trend Rate |  |  |  |
Initial health care cost for employees under age of 65 (as a percent) | 6.30% |  |  |
Ultimate health care cost for employees under age of 65 (as a percent) | 4.60% |  |  |
Initial Health care cost for employees of age 65 and over (as a percent) | 6.70% |  |  |
Ultimate health care cost for employees of age 65 and over (as a percent) | 4.50% |  |  |
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 | $ 78 |  |  |
Effect on total of service and interest cost components -1 Percentage Point Decrease | (66) |  |  |
Effect on post-retirement benefit obligation -1 Percentage Point Increase | 1,021 |  |  |
Effect on post-retirement benefit obligation -1 Percentage Point Decrease | (879) |  |  |
Defined contribution plan |  |  |  |
Employer's contribution | $ 2,100 |  | 1,900 | 1,900
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 |  |  |  |
Estimated future benefit payments |  |  |  |
Increase (Decrease) in Pension and Postretirement Obligations | $ 616 |  | (2,356) | 4,396
Pension Benefits |  |  |  |
Regulatory Adjustment: |  |  |  |
Amount of under-collection included in the two-way pension balancing account | $ (523) |  | $ (1,622) | 1,920
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 | $ 142,174 |  | $ 140,561 | $ 127,534
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Unfunded Commitments | 0 |  |  |
Employer contributions | 6,739 |  | $ 8,209 |
Expected employer's contribution in 2013 | 5,500 |  |  |
Estimated future benefit payments |  |  |  |
2014 | 5,857 |  |  |
2015 | 6,381 |  |  |
2016 | 6,865 |  |  |
2017 | 7,393 |  |  |
2018 | 7,980 |  |  |
Thereafter | 48,469 |  |  |
Total | $ 82,945 |  |  |
Expected long-term return on plan assets (as a percentage) | 7.00% |  | 7.00% | 7.00%
Pension Benefits | Fair Value, Inputs, Level 1 [Member] |  |  |  |
Employer's contribution and fair value of plan assets |  |  |  |
Total investments measured at fair value |  |  | $ 140,561 |
Pension Benefits | Level 2 |  |  |  |
Employer's contribution and fair value of plan assets |  |  |  |
Total investments measured at fair value |  |  | 0 |
Pension Benefits | Fair Value, Inputs, Level 3 [Member] |  |  |  |
Employer's contribution and fair value of plan assets |  |  |  |
Total investments measured at fair value |  |  | 0 |
Pension Benefits | Total |  |  |  |
Employer's contribution and fair value of plan assets |  |  |  |
Total investments measured at fair value |  |  | $ 140,561 |
Pension Benefits | Cash equivalents |  |  |  |
Actual and Target Asset Allocations |  |  |  |
Actual Asset Allocations, Total (as a percent) | 0.00% |  | 0.00% |
Employer's contribution and fair value of plan assets |  |  |  |
Total investments measured at fair value | $ 469 |  |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Unfunded Commitments | 0 |  |  |
Pension Benefits | Cash equivalents | Fair Value, Inputs, Level 1 [Member] |  |  |  |
Employer's contribution and fair value of plan assets |  |  |  |
Total investments measured at fair value |  |  | $ 497 |
Pension Benefits | Cash equivalents | Level 2 |  |  |  |
Employer's contribution and fair value of plan assets |  |  |  |
Total investments measured at fair value |  |  | 0 |
Pension Benefits | Cash equivalents | Fair Value, Inputs, Level 3 [Member] |  |  |  |
Employer's contribution and fair value of plan assets |  |  |  |
Total investments measured at fair value |  |  | 0 |
Pension Benefits | Cash equivalents | Total |  |  |  |
Employer's contribution and fair value of plan assets |  |  |  |
Total investments measured at fair value |  |  | 497 |
Pension Benefits | Fixed income securities |  |  |  |
Employer's contribution and fair value of plan assets |  |  |  |
Total investments measured at fair value | 56,218 |  |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Unfunded Commitments | $ 0 |  |  |
Pension Benefits | Fixed income securities | Fair Value, Inputs, Level 1 [Member] |  |  |  |
Employer's contribution and fair value of plan assets |  |  |  |
Total investments measured at fair value |  |  | 54,865 |
Pension Benefits | Fixed income securities | Level 2 |  |  |  |
Employer's contribution and fair value of plan assets |  |  |  |
Total investments measured at fair value |  |  | 0 |
Pension Benefits | Fixed income securities | Fair Value, Inputs, Level 3 [Member] |  |  |  |
Employer's contribution and fair value of plan assets |  |  |  |
Total investments measured at fair value |  |  | 0 |
Pension Benefits | Fixed income securities | Total |  |  |  |
Employer's contribution and fair value of plan assets |  |  |  |
Total investments measured at fair value |  |  | $ 54,865 |
Pension Benefits | Equity securities |  |  |  |
Actual and Target Asset Allocations |  |  |  |
Actual Asset Allocations, Total (as a percent) | 55.00% |  | 61.00% |
Target Asset Allocation for 2013, Total (as a percent) | 60.00% |  |  |
Pension Benefits | Equity securities | Fair Value, Inputs, Level 1 [Member] |  |  |  |
Employer's contribution and fair value of plan assets |  |  |  |
Total investments measured at fair value |  |  | $ 85,199 |
Pension Benefits | Equity securities | Level 2 |  |  |  |
Employer's contribution and fair value of plan assets |  |  |  |
Total investments measured at fair value |  |  | 0 |
Pension Benefits | Equity securities | Fair Value, Inputs, Level 3 [Member] |  |  |  |
Employer's contribution and fair value of plan assets |  |  |  |
Total investments measured at fair value |  |  | 0 |
Pension Benefits | Equity securities | Total |  |  |  |
Employer's contribution and fair value of plan assets |  |  |  |
Total investments measured at fair value |  |  | 85,199 |
Pension Benefits | U.S. small cap stocks |  |  |  |
Employer's contribution and fair value of plan assets |  |  |  |
Total investments measured at fair value | $ 21,219 |  |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Unfunded Commitments | 0 |  |  |
Pension Benefits | U.S. small cap stocks | Fair Value, Inputs, Level 1 [Member] |  |  |  |
Employer's contribution and fair value of plan assets |  |  |  |
Total investments measured at fair value |  |  | 22,325 |
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 |
Pension Benefits | U.S. small cap stocks | Fair Value, Inputs, Level 3 [Member] |  |  |  |
Employer's contribution and fair value of plan assets |  |  |  |
Total investments measured at fair value |  |  | 0 |
Pension Benefits | U.S. small cap stocks | Total |  |  |  |
Employer's contribution and fair value of plan assets |  |  |  |
Total investments measured at fair value |  |  | 22,325 |
Pension Benefits | U.S. large cap stocks |  |  |  |
Employer's contribution and fair value of plan assets |  |  |  |
Total investments measured at fair value | 42,395 |  |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Unfunded Commitments | 0 |  |  |
Pension Benefits | U.S. large cap stocks | Fair Value, Inputs, Level 1 [Member] |  |  |  |
Employer's contribution and fair value of plan assets |  |  |  |
Total investments measured at fair value |  |  | 42,886 |
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 |
Pension Benefits | U.S. large cap stocks | Fair Value, Inputs, Level 3 [Member] |  |  |  |
Employer's contribution and fair value of plan assets |  |  |  |
Total investments measured at fair value |  |  | 0 |
Pension Benefits | U.S. large cap stocks | Total |  |  |  |
Employer's contribution and fair value of plan assets |  |  |  |
Total investments measured at fair value |  |  | 42,886 |
Pension Benefits | International funds |  |  |  |
Employer's contribution and fair value of plan assets |  |  |  |
Total investments measured at fair value | 14,455 |  |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Unfunded Commitments | 0 |  |  |
Pension Benefits | International funds | Fair Value, Inputs, Level 1 [Member] |  |  |  |
Employer's contribution and fair value of plan assets |  |  |  |
Total investments measured at fair value |  |  | 11,318 |
Pension Benefits | International funds | Level 2 |  |  |  |
Employer's contribution and fair value of plan assets |  |  |  |
Total investments measured at fair value |  |  | 0 |
Pension Benefits | International funds | Fair Value, Inputs, Level 3 [Member] |  |  |  |
Employer's contribution and fair value of plan assets |  |  |  |
Total investments measured at fair value |  |  | 0 |
Pension Benefits | International funds | Total |  |  |  |
Employer's contribution and fair value of plan assets |  |  |  |
Total investments measured at fair value |  |  | $ 11,318 |
Pension Benefits | Equity Funds [Member] |  |  |  |
Employer's contribution and fair value of plan assets |  |  |  |
Total investments measured at fair value | 78,069 |  |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Unfunded Commitments | $ 0 |  |  |
Pension Benefits | Real Estate Funds [Member] |  |  |  |
Actual and Target Asset Allocations |  |  |  |
Actual Asset Allocations, Total (as a percent) | 5.00% |  | 0.00% |
Employer's contribution and fair value of plan assets |  |  |  |
Total investments measured at fair value | $ 7,418 |  |  |
Pension Benefits | Real estate funds |  |  |  |
Employer's contribution and fair value of plan assets |  |  |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Unfunded Commitments | $ 0 |  |  |
Pension Benefits | Real estate funds | Fair Value, Inputs, Level 1 [Member] |  |  |  |
Employer's contribution and fair value of plan assets |  |  |  |
Total investments measured at fair value |  |  | $ 8,670 |
Pension Benefits | Real estate funds | Level 2 |  |  |  |
Employer's contribution and fair value of plan assets |  |  |  |
Total investments measured at fair value |  |  | 0 |
Pension Benefits | Real estate funds | Fair Value, Inputs, Level 3 [Member] |  |  |  |
Employer's contribution and fair value of plan assets |  |  |  |
Total investments measured at fair value |  |  | 0 |
Pension Benefits | Real estate funds | Total |  |  |  |
Employer's contribution and fair value of plan assets |  |  |  |
Total investments measured at fair value |  |  | $ 8,670 |
Pension Benefits | Debt securities |  |  |  |
Actual and Target Asset Allocations |  |  |  |
Actual Asset Allocations, Total (as a percent) | 40.00% |  | 39.00% |
Target Asset Allocation for 2013, Total (as a percent) | 40.00% |  |  |
Pension Benefits | GSWC |  |  |  |
Regulatory Adjustment: |  |  |  |
Amount of under-collection included in the two-way pension balancing account | $ (523) |  | $ (1,600) | $ (1,900)
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 | $ 10,614 |  | $ 10,723 | $ 9,873
Employer contributions | 109 |  | 241 |
Estimated future benefit payments |  |  |  |
2014 | 535 |  |  |
2015 | 568 |  |  |
2016 | 626 |  |  |
2017 | 676 |  |  |
2018 | 722 |  |  |
Thereafter | 4,318 |  |  |
Total | 7,445 |  |  |
Post-Retirement Medical Plans | Fair Value, Inputs, Level 1 [Member] |  |  |  |
Employer's contribution and fair value of plan assets |  |  |  |
Total investments measured at fair value | 10,614 |  | 10,723 |
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 | Fair Value, Inputs, Level 3 [Member] |  |  |  |
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 | $ 10,614 |  | $ 10,723 |
Post-Retirement Medical Plans | Cash equivalents |  |  |  |
Actual and Target Asset Allocations |  |  |  |
Actual Asset Allocations, Total (as a percent) | 2.00% |  | 2.00% |
Post-Retirement Medical Plans | Cash equivalents | Fair Value, Inputs, Level 1 [Member] |  |  |  |
Employer's contribution and fair value of plan assets |  |  |  |
Total investments measured at fair value | $ 31 |  | $ 185 |
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 | Fair Value, Inputs, Level 3 [Member] |  |  |  |
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 | 31 |  | 185 |
Post-Retirement Medical Plans | Fixed income securities | Fair Value, Inputs, Level 1 [Member] |  |  |  |
Employer's contribution and fair value of plan assets |  |  |  |
Total investments measured at fair value | 4,182 |  | 4,105 |
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 | Fair Value, Inputs, Level 3 [Member] |  |  |  |
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 | $ 4,182 |  | $ 4,105 |
Post-Retirement Medical Plans | Equity securities |  |  |  |
Actual and Target Asset Allocations |  |  |  |
Actual Asset Allocations, Total (as a percent) | 60.00% |  | 60.00% |
Target Asset Allocation for 2013, Total (as a percent) | 60.00% |  |  |
Post-Retirement Medical Plans | U.S. large cap stocks | Fair Value, Inputs, Level 1 [Member] |  |  |  |
Employer's contribution and fair value of plan assets |  |  |  |
Total investments measured at fair value | $ 6,401 |  | $ 6,433 |
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 | Fair Value, Inputs, Level 3 [Member] |  |  |  |
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 | $ 6,401 |  | $ 6,433 |
Post-Retirement Medical Plans | Real Estate Funds [Member] |  |  |  |
Actual and Target Asset Allocations |  |  |  |
Actual Asset Allocations, Total (as a percent) | 0.00% |  | 0.00% |
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 | 411 |  |  |
2015 | 484 |  |  |
2016 | 635 |  |  |
2017 | 693 |  |  |
2018 | 1,093 |  |  |
Thereafter | 5,567 |  |  |
Total | 8,883 |  |  |
Balance in Rabbi Trust |  |  |  |
Balance in Rabbi Trust | 9,900 |  |  |
SERP | Rabbi Trust | Fair Value, Inputs, Level 1 [Member] |  |  |  |
Employer's contribution and fair value of plan assets |  |  |  |
Total investments measured at fair value | 9,866 |  | 8,765 |
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 | Fair Value, Inputs, Level 3 [Member] |  |  |  |
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 | 9,866 |  | 8,765 |
SERP | Rabbi Trust | Cash equivalents | Fair Value, Inputs, Level 1 [Member] |  |  |  |
Employer's contribution and fair value of plan assets |  |  |  |
Total investments measured at fair value | 39 |  | 29 |
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 | Fair Value, Inputs, Level 3 [Member] |  |  |  |
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 | 39 |  | 29 |
SERP | Rabbi Trust | Fixed income securities | Fair Value, Inputs, Level 1 [Member] |  |  |  |
Employer's contribution and fair value of plan assets |  |  |  |
Total investments measured at fair value | 3,903 |  | 3,454 |
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 | Fair Value, Inputs, Level 3 [Member] |  |  |  |
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 | 3,903 |  | 3,454 |
SERP | Rabbi Trust | Equity securities | Fair Value, Inputs, Level 1 [Member] |  |  |  |
Employer's contribution and fair value of plan assets |  |  |  |
Total investments measured at fair value | 5,924 |  | 5,282 |
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 | Fair Value, Inputs, Level 3 [Member] |  |  |  |
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 | 5,924 |  | $ 5,282 |
Pension Costs and Other Postretirement Benefit Costs [Member] | GSWC |  |  |  |
Regulatory Adjustment: |  |  |  |
Regulatory asset authorized under settlement | 19,800 |  |  |
Pension Costs and Other Postretirement Benefit Costs [Member] | Two-way pension balancing account | GSWC |  |  |  |
Regulatory Adjustment: |  |  |  |
Regulatory asset authorized under settlement | $ 2,200 |  |  |
[1] | *7.0% for union plan, 4.2% for non-union, net of income taxes in 2015, 2014 and 2013.

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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (m) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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- Definition The amount of unfunded commitments for which the entity is obligated, to those certain investments for which net asset value per share is calculated (including by unit, membership interest, or other equity (ownership interest) unit measure) (alternative investments). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 6A -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=36462937&loc=SL6742756-110258 + Details
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