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Income Taxes Components of Deferred Tax Assets and Liabilities (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2013 | Dec. 31, 2012
--- | --- | ---
Income Taxes [Line Items] |  |
Deferred Tax Assets, Advances and Contributions | $ 15,598 | $ 15,214
Deferred tax assets: |  |
Unamortized investment tax credit | 741 | 773
Pensions and postretirement benefits | 4,405 | 4,565
California franchise tax | 1,107 | 1,193
Net operating loss | 5,814 | 6,439
Other | 1,596 | 1,505
Total deferred tax assets | 29,261 | 29,689
Deferred tax liabilities: |  |
Utility plant | 125,706 | 110,983
Pension and postretirement benefits | 25,649 | 46,315
Investment in stock | 3,228 | 2,487
Deferred gain and other-property related | 13,107 | 14,440
Debt reacquisition costs | 496 | 545
Other | 1,811 | 2,498
Total deferred tax liabilities | 169,997 | 177,268
Net deferred tax liabilities | 140,736 | 147,579
Federal |  |
Deferred tax liabilities: |  |
Net operating loss carryforward | 16,610 |
Operating loss carryforward as reported on tax return | $ 18,234 |

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