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Taxes on Income (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2017 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Taxes on income |  |  |  |  |
Unrecognized Tax Benefits |  | $ 0 | $ 0 | $ 0 |
Deferred tax assets: |  |  |  |  |
Regulatory-liability-related |  | 33,080,000 | 33,419,000 |  |
Contributions and advances |  | 5,777,000 | 5,281,000 |  |
Deferred Tax Assets, Other |  | 5,792,000 | 2,988,000 |  |
Deferred tax assets |  | 44,649,000 | 41,688,000 |  |
Deferred tax liabilities: |  |  |  |  |
Fixed assets |  | (144,444,000) | (131,413,000) |  |
Regulatory-asset-related: depreciation and other |  | (20,641,000) | (18,146,000) |  |
Balancing and memorandum accounts (non-flow-through) |  | (4,868,000) | (6,325,000) |  |
Deferred tax liabilities |  | (169,953,000) | (155,884,000) |  |
Accumulated deferred income taxes - net |  | (125,304,000) | (114,196,000) |  |
Current |  |  |  |  |
Federal |  | 12,507,000 | 17,252,000 | 20,978,000 |
State |  | 5,540,000 | 6,538,000 | 5,844,000 |
Total current tax expense |  | 18,047,000 | 23,790,000 | 26,822,000 |
Deferred |  |  |  |  |
Federal |  | 6,407,000 | (4,334,000) | 11,543,000 |
State |  | 216,000 | (1,439,000) | 609,000 |
Total deferred tax (benefit) expense |  | 6,623,000 | (5,773,000) | 12,152,000 |
Reconciliations of the effective tax rates to the federal statutory rate |  |  |  |  |
Federal taxes on pretax income at statutory rate (21% in 2018; 35% in 2017 and 2016) |  | 22,872,000 | 17,196,000 | 37,919,000 |
Increase (decrease) in taxes resulting from: |  | 4,758,000 | 3,693,000 | 4,382,000 |
Change in tax rate |  | 0 | (14,000) | (82,000) |
Excess deferred tax amortization |  | (1,579,000) | (2,101,000) | 0 |
Flow-through on fixed assets |  | 1,244,000 | 429,000 | 845,000 |
Flow-through on removal costs |  | (1,582,000) | (1,445,000) | (1,980,000) |
Domestic production activities deduction |  | 0 | (26,000) | (1,421,000) |
Investment tax credit |  | (71,000) | (69,000) | (93,000) |
Other- net |  | (972,000) | 354,000 | (596,000) |
Total income tax expense operations |  | 24,670,000 | 18,017,000 | 38,974,000 |
Income before income tax expense |  | $ 109,012,000 | $ 81,888,000 | $ 108,341,000 |
Effective income tax rate (as a percent) |  | 22.60% | 22.00% | 36.00% |
Proceeds from Income Tax Refunds | $ 2,200,000 |  |  |  | $ 2,100,000
GSWC |  |  |  |  |
Deferred tax assets: |  |  |  |  |
Regulatory-liability-related |  | $ 33,080,000 | $ 33,419,000 |  |
Contributions and advances |  | 6,158,000 | 5,666,000 |  |
Deferred Tax Assets, Other |  | 6,618,000 | 3,310,000 |  |
Deferred tax assets |  | 45,856,000 | 42,395,000 |  |
Deferred tax liabilities: |  |  |  |  |
Fixed assets |  | (147,759,000) | (135,617,000) |  |
Regulatory-asset-related: depreciation and other |  | (20,641,000) | (18,146,000) |  |
Balancing and memorandum accounts (non-flow-through) |  | (5,262,000) | (6,873,000) |  |
Deferred tax liabilities |  | (173,662,000) | (160,636,000) |  |
Accumulated deferred income taxes - net |  | (127,806,000) | (118,241,000) |  |
Current |  |  |  |  |
Federal |  | 9,616,000 | 14,488,000 | $ 15,044,000 |
State |  | 5,480,000 | 5,932,000 | 5,045,000 |
Total current tax expense |  | 15,096,000 | 20,420,000 | 20,089,000 |
Deferred |  |  |  |  |
Federal |  | 4,924,000 | (5,531,000) | 11,770,000 |
State |  | 157,000 | (1,286,000) | 2,200,000 |
Total deferred tax (benefit) expense |  | 5,081,000 | (6,817,000) | 13,970,000 |
Reconciliations of the effective tax rates to the federal statutory rate |  |  |  |  |
Federal taxes on pretax income at statutory rate (21% in 2018; 35% in 2017 and 2016) |  | 18,236,000 | 12,939,000 | 30,736,000 |
Increase (decrease) in taxes resulting from: |  | 4,656,000 | 3,335,000 | 4,924,000 |
Change in tax rate |  | 0 | 0 |  |
Excess deferred tax amortization |  | (1,579,000) | (2,101,000) | 0 |
Flow-through on fixed assets |  | 1,244,000 | 429,000 | 845,000 |
Flow-through on removal costs |  | (1,582,000) | (1,445,000) | (1,980,000) |
Domestic production activities deduction |  | 0 | (25,000) | (1,148,000) |
Investment tax credit |  | (71,000) | (69,000) | (93,000) |
Other- net |  | (727,000) | 540,000 | (288,000) |
Total income tax expense operations |  | 20,177,000 | 13,603,000 | 34,059,000 |
Income before income tax expense |  | 86,840,000 | 61,615,000 | 87,816,000 |
Pretax income from operations |  | $ 86,840,000 | $ 61,615,000 | $ 87,816,000 |
Effective income tax rate (as a percent) |  | 23.20% | 22.10% | 38.80% |

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