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Employee Benefit Plans (Details 2) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2015
Dec. 31, 2014
Amounts recognized on the balance sheets:          
Non-current liabilities       $ (42,666) $ (61,773)
GSWC          
Amounts recognized on the balance sheets:          
Non-current liabilities       (42,666) (61,773)
Pension Benefits          
Change in Projected Benefit Obligation:          
Projected benefit obligation at beginning of year $ 185,184 $ 152,680      
Service cost 6,276 5,643 $ 6,967    
Interest cost 7,686 7,520 6,907    
Actuarial loss (gain) 24,413 (24,339)      
Benefits/expenses paid (5,799) (4,998)      
Projected benefit obligation at end of year 168,934 185,184 152,680    
Changes in Plan Assets:          
Fair value of plan assets at beginning of year 140,561 127,534      
Actual return on plan assets 673 9,816      
Employer contributions 6,739 8,209      
Benefits/expenses paid (5,799) (4,998)      
Fair value of plan assets at end of year 142,174 140,561 127,534    
Funded Status:          
Net amount recognized as accrued pension cost       (26,760) (44,623)
Amounts recognized on the balance sheets:          
Non-current assets       0 0
Current liabilities       0 0
Non-current liabilities       (26,760) (44,623)
Net amount recognized       (26,760) (44,623)
Amounts recognized in regulatory assets consist of:          
Initial net obligation       0 0
Prior service cost (credit)       49 167
Net (gain) loss       21,921 39,003
Regulatory assets 39,170 15,866 15,866 21,970 39,170
Unfunded accrued pension cost       4,790 5,453
Net liability recognized       26,760 44,623
Changes in plan assets and benefit obligations recognized in regulatory assets:          
Regulatory asset at beginning of year 39,170 15,866      
Net loss (gain) (15,292) 23,422      
Amortization of initial net obligation 0 0      
Amortization of prior service (cost) credit (118) (118)      
Amortization of net loss (1,790) 0      
Total change in regulatory asset (17,200) 23,304      
Regulatory asset at end of year 21,970 39,170 15,866    
Change in regulatory asset (17,200) 23,304      
Net periodic pension costs 6,075 4,383 9,296    
Total recognized in net periodic pension cost and regulatory asset (11,125) 27,687      
Estimated amounts that will be amortized from regulatory asset over the next fiscal year:          
Initial net obligation 0 0      
Defined Benefit Plan, Future Amortization of Prior Service Cost (Credit) (49) (118)      
Net loss (510) (1,878)      
Additional year-end information for plans with an accumulated benefit obligation in excess of plan assets:          
Projected benefit obligation       168,934 185,184
Accumulated benefit obligation       155,469 160,510
Fair value of plan assets       $ 142,174 $ 140,561
Weighted-average assumptions used to determine benefit obligations at year end:          
Discount rate (as a percent)       4.65% 4.25%
Rate of compensation increase (as a percent)         4.00%
Components of Net Periodic Benefits Cost:          
Service cost 6,276 5,643 6,967    
Interest cost 7,686 7,520 6,907    
Expected return on plan assets (9,795) (8,898) (7,574)    
Amortization of transition 0 0 0    
Amortization of prior service cost (benefit) 118 118 118    
Amortization of actuarial loss 1,790 0 2,878    
Net periodic pension costs (6,075) (4,383) (9,296)    
Regulatory adjustment - deferred 523 1,622 (1,920)    
Total expense recognized, before allocation to overhead pool $ 6,598 $ 6,005 $ 7,376    
Weighted-average assumptions used to determine net periodic cost:          
Discount rate (as a percent) 4.25% 5.10% 4.30%    
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 $ 523 $ 1,600 $ 1,900    
Post-Retirement Medical Benefits          
Change in Projected Benefit Obligation:          
Projected benefit obligation at beginning of year 12,326 11,388      
Service cost 340 348 407    
Interest cost 435 495 439    
Actuarial loss (gain) 3,375 (437)      
Benefits/expenses paid (333) (342)      
Projected benefit obligation at end of year 9,393 12,326 11,388    
Changes in Plan Assets:          
Fair value of plan assets at beginning of year 10,723 9,873      
Actual return on plan assets 115 951      
Employer contributions 109 241      
Benefits/expenses paid (333) (342)      
Fair value of plan assets at end of year 10,614 10,723 9,873    
Funded Status:          
Net amount recognized as accrued pension cost       $ 1,221 $ (1,603)
Amounts recognized on the balance sheets:          
Non-current assets       1,221 0
Current liabilities       0 0
Non-current liabilities       0 (1,603)
Net amount recognized       1,221 (1,603)
Amounts recognized in regulatory assets consist of:          
Initial net obligation       0 0
Prior service cost (credit)       (34) (234)
Net (gain) loss       (5,572) (2,891)
Regulatory assets (3,125) (3,175) (3,175) (5,606) (3,125)
Unfunded accrued pension cost       4,385 4,728
Net liability recognized       (1,221) 1,603
Changes in plan assets and benefit obligations recognized in regulatory assets:          
Regulatory asset at beginning of year (3,125) (3,175)      
Net loss (gain) (2,997) (61)      
Amortization of initial net obligation 0 (419)      
Amortization of prior service (cost) credit 200 200      
Amortization of net loss 316 330      
Total change in regulatory asset (2,481) 50      
Regulatory asset at end of year (5,606) (3,125) (3,175)    
Change in regulatory asset (2,481) 50      
Net periodic pension costs (234) 278 676    
Total recognized in net periodic pension cost and regulatory asset (2,715) 328      
Estimated amounts that will be amortized from regulatory asset over the next fiscal year:          
Initial net obligation 0 0      
Defined Benefit Plan, Future Amortization of Prior Service Cost (Credit) 34 200      
Net loss 599 213      
Additional year-end information for plans with an accumulated benefit obligation in excess of plan assets:          
Projected benefit obligation       9,393 12,326
Fair value of plan assets       $ 10,614 $ 10,723
Weighted-average assumptions used to determine benefit obligations at year end:          
Discount rate (as a percent)       4.25% 3.80%
Components of Net Periodic Benefits Cost:          
Service cost 340 348 407    
Interest cost 435 495 439    
Expected return on plan assets (493) (453) (382)    
Amortization of transition 0 418 419    
Amortization of prior service cost (benefit) (200) (200) (200)    
Amortization of actuarial loss (316) (330) (7)    
Net periodic pension costs 234 (278) (676)    
Regulatory adjustment - deferred 0 0 0    
Total expense recognized, before allocation to overhead pool $ (234) $ 278 $ 676    
Weighted-average assumptions used to determine net periodic cost:          
Discount rate (as a percent) 3.80% 4.65% 3.75%    
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 $ 15,926 $ 12,296      
Service cost 814 768 $ 803    
Interest cost 653 615 514    
Actuarial loss (gain) (683) 2,497      
Benefits/expenses paid (393) (250)      
Projected benefit obligation at end of year 16,317 15,926 12,296    
Changes in Plan Assets:          
Fair value of plan assets at beginning of year 0        
Benefits/expenses paid (393) (250)      
Fair value of plan assets at end of year 0 0      
Funded Status:          
Net amount recognized as accrued pension cost       $ (16,317) $ (15,926)
Amounts recognized on the balance sheets:          
Current liabilities       (411) (379)
Non-current liabilities       (15,906) (15,547)
Net amount recognized       (16,317) (15,926)
Amounts recognized in regulatory assets consist of:          
Prior service cost (credit)       36 153
Net (gain) loss       3,416 4,530
Regulatory assets 4,683 2,486 2,486 3,452 4,683
Unfunded accrued pension cost       12,865 11,243
Net liability recognized       16,317 15,926
Changes in plan assets and benefit obligations recognized in regulatory assets:          
Regulatory asset at beginning of year 4,683 2,486      
Net loss (gain) (683) 2,497      
Amortization of prior service (cost) credit (117) (161)      
Amortization of net loss (431) (139)      
Total change in regulatory asset (1,231) 2,197      
Regulatory asset at end of year 3,452 4,683 2,486    
Change in regulatory asset (1,231) 2,197      
Net periodic pension costs 2,015 1,683 1,817    
Total recognized in net periodic pension cost and regulatory asset 784 3,880      
Estimated amounts that will be amortized from regulatory asset over the next fiscal year:          
Initial net obligation 0 0      
Prior service cost 25 117      
Net loss (292) (431)      
Additional year-end information for plans with an accumulated benefit obligation in excess of plan assets:          
Accumulated benefit obligation       14,533 13,992
Fair value of plan assets       $ 0 $ 0
Weighted-average assumptions used to determine benefit obligations at year end:          
Discount rate (as a percent)       4.61% 4.15%
Rate of compensation increase (as a percent)       4.00% 4.00%
Components of Net Periodic Benefits Cost:          
Service cost 814 768 803    
Interest cost 653 615 514    
Amortization of prior service cost (benefit) 117 161 161    
Amortization of actuarial loss 431 139 339    
Net periodic pension costs $ (2,015) $ (1,683) $ (1,817)    
Weighted-average assumptions used to determine net periodic cost:          
Discount rate (as a percent) 4.15% 5.05% 4.20%    
Rate of compensation increase (as a percent) 4.00% 4.00% 4.00%    
Minimum [Member] | Pension Benefits          
Weighted-average assumptions used to determine benefit obligations at year end:          
Rate of compensation increase (as a percent)       3.00%  
Maximum [Member] | Pension Benefits          
Weighted-average assumptions used to determine benefit obligations at year end:          
Rate of compensation increase (as a percent)       8.00%  
Real Estate Funds [Member] | Pension Benefits          
Changes in Plan Assets:          
Fair value of plan assets at end of year $ 7,418        
[1] *7.0% for union plan, 4.2% for non-union, net of income taxes in 2015, 2014 and 2013.