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Income Taxes Components of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Deferred tax assets: |  |  |  |
Advances and contributions | $ 16,212 | $ 16,612 | $ 16,212 |
Unamortized investment tax credit | 709 | 676 | 709 |
Pensions and postretirement benefits | 4,216 | 4,094 | 4,216 |
California franchise tax | 0 | 1,322 | 0 |
Net operating loss | 5,065 | 0 | 5,065 |
Other | 1,697 | 3,410 | 1,697 |
Total deferred tax assets | 27,899 | 26,114 | 27,899 |
Deferred tax liabilities: |  |  |  |
Utility plant | 150,662 | 165,293 | 150,662 |
Pension and postretirement benefits | 47,059 | 44,482 | 47,059 |
Investment in stock | 2,335 | 2,193 | 2,335 |
Deferred gain and other-property related | 11,695 | 11,686 | 11,695 |
Debt reacquisition costs | 443 | 397 | 443 |
Other | 1,211 | 838 | 1,211 |
Total deferred tax liabilities | 213,405 | 224,889 | 213,405 |
Net deferred tax liabilities | 185,506 | 198,775 | 185,506 |
Income Tax Credits and Adjustments | 880 |  |  |
Provision for income taxes |  | 23,272 | 24,971 | $ 14,135
Federal |  |  |  |
Deferred tax liabilities: |  |  |  |
Net operating loss carryforward |  | 15,854 |  |
State and Local Jurisdiction [Member] |  |  |  |
Deferred tax liabilities: |  |  |  |
Operating loss carryforward as reported on tax return |  | 1,525 |  |
Income Tax Credits and Adjustments |  |  | 77,999 |
Provision for income taxes |  |  | 4,482 |
Domestic Tax Authority [Member] |  |  |  |
Deferred tax liabilities: |  |  |  |
Other | 12,569 |  | 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 |  | 18,820 |  |
2015 Federal and State Repairs and Maintenance Deduction [Member] | State and Local Jurisdiction [Member] |  |  |  |
Deferred tax liabilities: |  |  |  |
Provision for income taxes |  | (1,081) |  |
2015 Federal and State Repairs and Maintenance Deduction [Member] | Domestic Tax Authority [Member] |  |  |  |
Deferred tax liabilities: |  |  |  |
Other |  | $ 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 |  | $ 3,927 |

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