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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

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