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Income Taxes Components of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2014 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Deferred tax assets: |  |  |  |  |  |
Advances and contributions | $ 9,929 |  |  | $ 9,929 | $ 17,196 |
Unamortized investment tax credit | 441 |  |  | 441 | 644 |
Pensions and postretirement benefits | 21,349 |  |  | 21,349 | 3,927 |
California franchise tax | 1,058 |  |  | 1,058 | 2,331 |
Other | 3,110 |  |  | 3,110 | 4,802 |
Total deferred tax assets | 35,887 |  |  | 35,887 | 28,900 |
Deferred tax liabilities: |  |  |  |  |  |
Utility plant | 94,414 |  |  | 94,414 | 177,338 |
Pension and postretirement benefits | 19,184 |  |  | 19,184 | 44,737 |
Investment in stock | 1,199 |  |  | 1,199 | 1,280 |
Deferred gain and other-property related | 5,640 |  |  | 5,640 | 9,769 |
Debt reacquisition costs | 204 |  |  | 204 | 347 |
Other | 1,041 |  |  | 1,041 | 632 |
Total deferred tax liabilities | (121,682) |  |  | (121,682) | (234,103) |
Net deferred tax liabilities | 85,795 |  |  | 85,795 | 205,203 |
Deferred tax liabilities, period increase (decrease) |  |  |  | (119,408) | 6,428 |
Income tax credits and adjustments |  |  | $ 880 | 117 |  |
Deferred tax liabilities non-cash items |  |  |  |  | 1,625 |
Provision for income taxes |  |  |  | 35,393 | 33,542 | $ 23,272
Provisional income tax expense deferred taxes revaluation | 2,357 |  |  |  |  |
2017 Federal and State Repairs and Maintenance Deduction [Member] |  |  |  |  |  |
Deferred tax liabilities: |  |  |  |  |  |
Income tax credits and adjustments |  |  |  | 20,168 |  |
2017 Federal and State Repairs and Maintenance Deduction [Member] | State and Local Jurisdiction |  |  |  |  |  |
Deferred tax liabilities: |  |  |  |  |  |
Provision for income taxes |  |  |  | (1,159) |  |
2017 Federal and State Repairs and Maintenance Deduction [Member] | Domestic Tax Authority |  |  |  |  |  |
Deferred tax liabilities: |  |  |  |  |  |
Other | 7,059 |  |  | 7,059 |  |
2016 Federal and State Repairs and Maintenance Deduction [Member] |  |  |  |  |  |
Deferred tax liabilities: |  |  |  |  |  |
Income tax credits and adjustments |  |  |  |  | 20,611 |
2016 Federal and State Repairs and Maintenance Deduction [Member] | State and Local Jurisdiction |  |  |  |  |  |
Deferred tax liabilities: |  |  |  |  |  |
Provision for income taxes |  |  |  |  | (1,184) |
2016 Federal and State Repairs and Maintenance Deduction [Member] | Domestic Tax Authority |  |  |  |  |  |
Deferred tax liabilities: |  |  |  |  |  |
Other |  |  |  |  | 7,214 |
California Franchise Tax Board |  |  |  |  |  |
Deferred tax liabilities: |  |  |  |  |  |
Income tax refund |  | $ 1,294 |  |  |  |
Operating loss carryback |  | $ 404 |  |  |  |
Deferred Taxes Related to Pensions, Accrued Vacation and Asset Retirement Obligations |  |  |  |  |  |
Deferred tax liabilities: |  |  |  |  |  |
Total deferred tax liabilities | 27,833 |  |  | 27,833 | $ 47,123 |
Deferred Income Tax Charge |  |  |  |  |  |
Deferred tax liabilities: |  |  |  |  |  |
Deferred tax liabilities, period increase (decrease) |  |  |  | $ 118,972 |  |
Provisional income tax expense deferred taxes revaluation | $ 83,666 |  |  |  |  |

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