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Employee Benefit Plans (Details 2) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Amounts recognized on the balance sheets:      
Non-current liabilities $ (38,726) $ (71,618)  
Components of Net Periodic Benefits Cost:      
Regulatory adjustment - deferred 214 11,709 18,748
GSWC
      
Amounts recognized on the balance sheets:      
Non-current liabilities (38,726) (71,618)  
Components of Net Periodic Benefits Cost:      
Regulatory adjustment - deferred 214 11,709 18,748
Pension Benefits
      
Change in Projected Benefit Obligation:      
Projected benefit obligation at beginning of year 163,230 146,127  
Service cost 6,967 6,675 5,624
Interest cost 6,907 6,657 6,524
Actuarial loss (gain) (19,918) 7,759  
Benefits/expenses paid 4,506 3,988  
Projected benefit obligation at end of year 152,680 163,230 146,127
Changes in Plan Assets:      
Fair value of plan assets at beginning of year 107,638 92,910  
Actual return on plan assets 17,846 12,599  
Employer contributions 6,556 6,117  
Benefits/expenses paid 4,506 3,988  
Fair value of plan assets at end of year 127,534 107,638 92,910
Funded Status:      
Net amount recognized as accrued pension cost (25,146) (55,592)  
Amounts recognized on the balance sheets:      
Current liabilities 0 0  
Non-current liabilities (25,146) (55,592)  
Net amount recognized (25,146) (55,592)  
Amounts recognized in regulatory assets consist of:      
Initial net obligation 0 0  
Prior service cost (credit) 285 404  
Net loss 15,581 48,648  
Regulatory assets 15,866 49,052 50,505
Unfunded accrued pension cost 9,280 6,540  
Net liability recognized (25,146) (55,592)  
Changes in plan assets and benefit obligations recognized in regulatory assets:      
Regulatory asset at beginning of year 49,052 50,505  
Net loss (gain) (30,190) 1,700  
Amortization of initial net obligation 0 0  
Amortization of prior service (cost) credit   (118)  
Amortization of net loss (2,878) (3,035)  
Total change in regulatory asset (33,186) (1,453)  
Regulatory asset at end of year 15,866 49,052 50,505
Net periodic pension costs 9,296 9,945 7,159
Change in regulatory asset (33,186) (1,453)  
Total recognized in net periodic pension cost and regulatory asset (23,890) 8,492  
Estimated amounts that will be amortized from regulatory asset over the next fiscal year:      
Initial net obligation 0 0  
Prior service cost (118) (118)  
Net loss (29) (2,846)  
Additional year-end information for plans with an accumulated benefit obligation in excess of plan assets:      
Projected benefit obligation 152,680 163,230  
Accumulated benefit obligation 131,580 138,230  
Fair value of plan assets 127,534 107,368  
Weighted-average assumptions used to determine benefit obligations at year end:      
Discount rate (as a percent) 5.10% 4.30%  
Rate of compensation increase (as a percent) 4.00% 4.00%  
Components of Net Periodic Benefits Cost:      
Service cost 6,967 6,675 5,624
Interest cost 6,907 6,657 6,524
Expected return on plan assets (7,574) (6,540) (6,349)
Amortization of transition 0 0 0
Amortization of prior service cost (benefit) 118 118 118
Amortization of actuarial loss 2,878 3,035 1,242
Net periodic pension costs (9,296) (9,945) (7,159)
Regulatory adjustment - deferred (1,920) (2,305) (209)
Total expense recognized, before allocation to overhead pool 7,376 7,640 6,950
Weighted-average assumptions used to determine net periodic cost:      
Discount rate (as a percent) 4.30% 4.65% 5.55%
Expected long-term return on plan assets (as a percent) 7.00% 7.00% 7.00%
Rate of compensation increase (as a percent) 4.00% 4.00% 4.00%
Pension Benefits | GSWC
      
Components of Net Periodic Benefits Cost:      
Regulatory adjustment - deferred 1,900 2,300 200
Post-Retirement Medical Benefits
      
Change in Projected Benefit Obligation:      
Projected benefit obligation at beginning of year 12,296 12,448  
Service cost 407 419 391
Interest cost 439 534 549
Actuarial loss (gain) (1,340) (657)  
Benefits/expenses paid 414 448  
Projected benefit obligation at end of year 11,388 12,296 12,448
Changes in Plan Assets:      
Fair value of plan assets at beginning of year 8,359 7,916  
Actual return on plan assets 1,320 736  
Employer contributions 608 155  
Benefits/expenses paid 414 448  
Fair value of plan assets at end of year 9,873 8,359 7,916
Funded Status:      
Net amount recognized as accrued pension cost (1,515) (3,937)  
Amounts recognized on the balance sheets:      
Current liabilities 0 0  
Non-current liabilities (1,515) (3,937)  
Net amount recognized (1,515) (3,937)  
Amounts recognized in regulatory assets consist of:      
Initial net obligation 417 837  
Prior service cost (credit) (433) (633)  
Net loss (3,159) (889)  
Regulatory assets (3,175) (685) 570
Unfunded accrued pension cost 4,690 4,622  
Net liability recognized (1,515) (3,937)  
Changes in plan assets and benefit obligations recognized in regulatory assets:      
Regulatory asset at beginning of year (685) 570  
Net loss (gain) (2,278) (1,036)  
Amortization of initial net obligation (419) (419)  
Amortization of prior service (cost) credit 200 200  
Amortization of net loss 7 0  
Total change in regulatory asset (2,490) (1,255)  
Regulatory asset at end of year (3,175) (685) 570
Net periodic pension costs 676 815 861
Change in regulatory asset (2,490) (1,255)  
Total recognized in net periodic pension cost and regulatory asset (1,814) (440)  
Estimated amounts that will be amortized from regulatory asset over the next fiscal year:      
Initial net obligation (418) (419)  
Prior service cost 200 200  
Net loss 262 0  
Additional year-end information for plans with an accumulated benefit obligation in excess of plan assets:      
Projected benefit obligation 11,388 12,296  
Fair value of plan assets 9,873 8,359  
Weighted-average assumptions used to determine benefit obligations at year end:      
Discount rate (as a percent) 4.65% 3.75%  
Components of Net Periodic Benefits Cost:      
Service cost 407 419 391
Interest cost 439 534 549
Expected return on plan assets (382) (357) (298)
Amortization of transition 419 419 419
Amortization of prior service cost (benefit) (200) (200) (200)
Amortization of actuarial loss (7) 0 0
Net periodic pension costs (676) (815) (861)
Regulatory adjustment - deferred 0 0 0
Total expense recognized, before allocation to overhead pool 676 815 861
Weighted-average assumptions used to determine net periodic cost:      
Discount rate (as a percent) 3.75% 4.45% 5.20%
Union plan
      
Weighted-average assumptions used to determine net periodic cost:      
Expected long-term return on plan assets (as a percent) 7.00% [1] 7.00% 7.00%
Non-union plan
      
Weighted-average assumptions used to determine net periodic cost:      
Expected long-term return on plan assets (as a percent) 4.20% [1] 4.20% 4.20%
SERP
      
Change in Projected Benefit Obligation:      
Projected benefit obligation at beginning of year (12,406) (10,604)  
Service cost 803 731 600
Interest cost 514 488 464
Actuarial loss (gain) 1,198 (803)  
Benefits/expenses paid (229) (220)  
Projected benefit obligation at end of year (12,296) (12,406) (10,604)
Changes in Plan Assets:      
Fair value of plan assets at beginning of year 0    
Benefits/expenses paid (229) (220)  
Fair value of plan assets at end of year 0 0  
Funded Status:      
Net amount recognized as accrued pension cost (12,296) (12,406)  
Amounts recognized on the balance sheets:      
Current liabilities (230) (317)  
Non-current liabilities (12,066) (12,089)  
Net amount recognized (12,296) (12,406)  
Amounts recognized in regulatory assets consist of:      
Prior service cost (credit) 314 475  
Net loss 2,172 3,709  
Regulatory assets 2,486 4,184 3,848
Unfunded accrued pension cost 9,810 8,222  
Net liability recognized (12,296) (12,406)  
Changes in plan assets and benefit obligations recognized in regulatory assets:      
Regulatory asset at beginning of year 4,184 3,848  
Net loss (gain) (1,199) 805  
Amortization of prior service (cost) credit (161) (161)  
Amortization of net loss (338) (308)  
Total change in regulatory asset (1,698) 336  
Regulatory asset at end of year 2,486 4,184 3,848
Net periodic pension costs 1,817 1,687 1,359
Change in regulatory asset (1,698) 336  
Total recognized in net periodic pension cost and regulatory asset 119 2,023  
Estimated amounts that will be amortized from regulatory asset over the next fiscal year:      
Initial net obligation 0 0  
Prior service cost (161) (161)  
Net loss (139) (339)  
Additional year-end information for plans with an accumulated benefit obligation in excess of plan assets:      
Accumulated benefit obligation 10,116 9,601  
Fair value of plan assets 0 0  
Weighted-average assumptions used to determine benefit obligations at year end:      
Discount rate (as a percent) 5.05% 4.20%  
Rate of compensation increase (as a percent) 4.00% 4.00%  
Components of Net Periodic Benefits Cost:      
Service cost 803 731 600
Interest cost 514 488 464
Amortization of prior service cost (benefit) 161 161 161
Amortization of actuarial loss 339 307 134
Net periodic pension costs $ (1,817) $ (1,687) $ (1,359)
Weighted-average assumptions used to determine net periodic cost:      
Discount rate (as a percent) 4.20% 4.65% 5.55%
Rate of compensation increase (as a percent) 4.00% 4.00% 4.00%
[1] *7.0% for union plan, 4.2% for non-union, net of income taxes in 2013, 2012 and 2011.