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Taxes on Income (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Taxes on income |  |  |
Unrecognized Tax Benefits | $ 0 |  |
Deferred tax assets: |  |  |
Regulatory-liability-related: ITC and excess deferred taxes | 32,761,000 | $ 903,000 |
Regulatory-liability-related: California Corp Franchise Tax | 1,806,000 | 3,365,000 |
Other nonproperty-related | 2,509,000 | 1,993,000 |
Contributions and advances | 4,679,000 | 7,464,000 |
Deferred tax assets | 41,755,000 | 13,725,000 |
Deferred tax liabilities: |  |  |
Fixed assets | (130,115,000) | (200,378,000) |
Regulatory-asset-related: depreciation and other | (16,851,000) | (24,402,000) |
Deferred Tax Liabilities, Regulatory Assets and Liabilities Related to State Franchise Tax | (528,000) | (2,033,000) |
Other nonproperty-related | (47,000) | 0 |
Balancing and memorandum accounts | (7,311,000) | (7,010,000) |
Deferred charges | (2,594,000) | (4,429,000) |
Deferred tax liabilities | (157,446,000) | (238,252,000) |
Accumulated deferred income taxes - net | (115,691,000) | (224,527,000) |
Current |  |  |
Federal | 20,978,000 | 2,297,000 | $ 21,866,000
State | 5,844,000 | 4,798,000 | 5,442,000
Total current tax expense | 26,822,000 | 7,095,000 | 27,308,000
Deferred |  |  |
Federal | 11,543,000 | 26,715,000 | 8,948,000
State | 609,000 | 925,000 | 1,475,000
Total deferred tax expense | 12,152,000 | 27,640,000 | 10,423,000
Reconciliations of the effective tax rates to the federal statutory rate |  |  |
Federal taxes on pretax income at statutory rate | 37,919,000 | 33,067,000 | 34,375,000
Flow-through on removal costs | (1,421,000) | (78,000) | (1,560,000)
Effective Income Tax Rate Reconciliation, Tax Credit, Investment, Amount | (93,000) | (83,000) | (88,000)
Income tax expense/(benefit) | 38,974,000 | 34,735,000 | 37,731,000
Pretax income from continuing operations | $ 108,341,000 | $ 94,478,000 | $ 98,215,000
Effective income tax rate (as a percent) | 36.00% | 36.80% | 38.40%
Increase (decrease) in taxes resulting from: | $ 4,382,000 | $ 3,029,000 | $ 4,843,000
Adjustments recorded to revalue deferred taxes as a result of the tax cut and job act of 2017 effective tax rate impact | (82,000) | 0 | 0
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Depreciation, Amount | 845,000 | 994,000 | 626,000
Income Tax Reconciliation Flow Through on Pension Costs | 412,000 | (247,000) | 267,000
Income Tax Reconciliation Cost of Removal | (1,980,000) | (2,068,000) | (929,000)
Reduction to cumulative net deferred income tax liabilities | 90,100,000 |  |
Income Tax Examination, Penalties Accrued |  | 0 | 0
Effective Income Tax Rate Reconciliation, Other Adjustments, Amount | (1,008,000) | 121,000 | 197,000
Income Tax Examination, Penalties Expense |  | 0 | 0
Proceeds from Income Tax Refunds | 2,200,000 | 2,100,000 |
GSWC |  |  |
Deferred tax assets: |  |  |
Regulatory-liability-related: ITC and excess deferred taxes | 32,761,000 | 903,000 |
Regulatory-liability-related: California Corp Franchise Tax | 1,806,000 | 3,365,000 |
Other nonproperty-related | 2,230,000 | 1,901,000 |
Contributions and advances | 5,022,000 | 7,712,000 |
Deferred tax assets | 41,819,000 | 13,881,000 |
Deferred tax liabilities: |  |  |
Fixed assets | (134,437,000) | (203,133,000) |
Regulatory-asset-related: depreciation and other | (16,851,000) | (24,402,000) |
Deferred Tax Liabilities, Regulatory Assets and Liabilities Related to State Franchise Tax | (552,000) | (2,208,000) |
Other nonproperty-related | (53,000) | (68,000) |
Balancing and memorandum accounts | (7,897,000) | (7,271,000) |
Deferred charges | (2,809,000) | (4,597,000) |
Deferred tax liabilities | (162,599,000) | (241,679,000) |
Accumulated deferred income taxes - net | (120,780,000) | (227,798,000) |
Current |  |  |
Federal | 15,044,000 | (3,115,000) | 16,196,000
State | 5,045,000 | 3,625,000 | 5,557,000
Total current tax expense | 20,089,000 | 510,000 | 21,753,000
Deferred |  |  |
Federal | 11,770,000 | 25,864,000 | 8,536,000
State | 2,200,000 | 2,235,000 | 2,183,000
Total deferred tax expense | 13,970,000 | 28,099,000 | 10,719,000
Reconciliations of the effective tax rates to the federal statutory rate |  |  |
Federal taxes on pretax income at statutory rate | 30,736,000 | 26,452,000 | 28,022,000
Flow-through on removal costs | (1,148,000) | 0 | (1,268,000)
Effective Income Tax Rate Reconciliation, Tax Credit, Investment, Amount | (93,000) | (82,000) | (88,000)
Income tax expense/(benefit) | 34,059,000 | 28,609,000 | 32,472,000
Pretax income from continuing operations | $ 87,816,000 | $ 75,578,000 | $ 80,063,000
Effective income tax rate (as a percent) | 38.80% | 37.90% | 40.60%
Increase (decrease) in taxes resulting from: | $ 4,924,000 | $ 3,118,000 | $ 5,151,000
Adjustments recorded to revalue deferred taxes as a result of the tax cut and job act of 2017 effective tax rate impact | 1,063,000 | 0 | 0
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Depreciation, Amount | 845,000 | 994,000 | 626,000
Income Tax Reconciliation Flow Through on Pension Costs | 412,000 | (247,000) | 267,000
Income Tax Reconciliation Cost of Removal | (1,980,000) | (2,068,000) | (929,000)
Effective Income Tax Rate Reconciliation, Other Adjustments, Amount | $ (700,000) | $ 442,000 | $ 691,000

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- Definition Amount of income (loss) from continuing operations before deduction of income tax expense (benefit) and income (loss) attributable to noncontrolling interest, and addition of income (loss) from equity method investments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)(1)(i)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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- Definition The amount of estimated penalties accrued as of the balance sheet date arising from income tax examinations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32718-109319 + Details
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- Definition Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32639-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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- Definition The amount of income tax expense or benefit for the period computed by applying the domestic federal statutory tax rates to pretax income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(h)(2)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319 + Details
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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to nondeductible depreciation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 + Details
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