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Income Taxes Components of Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Thousands
 6 Months Ended 12 Months Ended
Jun. 09, 2016
Jun. 30, 2014
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Income Taxes [Line Items]          
Public Utilities, Approved Rate Increase, Percentage, Year 1 8.60%        
Deferred tax assets:          
Advances and contributions     $ 17,196 $ 16,612  
Unamortized investment tax credit     644 676  
Pensions and postretirement benefits     3,927 4,094  
California franchise tax     2,331 1,322  
Other     4,802 3,410  
Total deferred tax assets     28,900 26,114  
Deferred tax liabilities:          
Utility plant     177,338 165,293  
Pension and postretirement benefits     44,737 44,482  
Investment in stock     1,280 2,193  
Deferred gain and other-property related     9,769 11,686  
Debt reacquisition costs     347 397  
Other     632 838  
Total deferred tax liabilities     234,103 224,889  
Net deferred tax liabilities     205,203 198,775  
Income Tax Credits and Adjustments   $ 880 117    
Provision for income taxes     33,542 23,272 $ 24,971
State and Local Jurisdiction [Member]          
Deferred tax liabilities:          
Income Tax Credits and Adjustments         77,999
Provision for income taxes         4,482
Domestic Tax Authority [Member]          
Deferred tax liabilities:          
Other         12,569
Income Tax Credits and Adjustments         35,912
2015 Federal and State Repairs and Maintenance Deduction [Member]          
Deferred tax liabilities:          
Income Tax Credits and Adjustments     20,611 18,820  
2015 Federal and State Repairs and Maintenance Deduction [Member] | State and Local Jurisdiction [Member]          
Deferred tax liabilities:          
Provision for income taxes     (1,184) (1,081)  
2015 Federal and State Repairs and Maintenance Deduction [Member] | Domestic Tax Authority [Member]          
Deferred tax liabilities:          
Other     $ 7,214 $ 6,587  
2014 Federal and State Repairs and Maintenance Deduction [Member]          
Deferred tax liabilities:          
Income Tax Credits and Adjustments         11,221
2014 Federal and State Repairs and Maintenance Deduction [Member] | State and Local Jurisdiction [Member]          
Deferred tax liabilities:          
Provision for income taxes         (645)
2014 Federal and State Repairs and Maintenance Deduction [Member] | Domestic Tax Authority [Member]          
Deferred tax liabilities:          
Other         $ 3,927