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Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2018
Income Tax Disclosure [Abstract] |
Income tax expense reconciliation | Income tax expense differs from the amount computed by applying the statutory rate on book income subject to tax for the following reasons:
|  | (Thousands of Dollars)
|  | Years Ended December 31,
|  | 2018 |  | 2017 |  | 2016
Income Tax at Statutory Rate |  | $ | 7,009 |  |  | $ | 11,868 |  |  | $ | 12,007 |
Tax Effect of: |  |  |  |  |  |  |  |  |  |  |  |
Utility Plant Related |  |  | 422 |  |  |  | (1,016 | ) |  |  | (1,059 | )
Tangible Property Repairs |  |  | (7,763 | ) |  |  | — |  |  |  | — |
State Income Taxes – Net |  |  | 1,207 |  |  |  | 895 |  |  |  | 770 |
Tax Act |  |  | — |  |  |  | (610 | ) |  |  | — |
Other |  |  | 49 |  |  |  | (37 | ) |  |  | 17 |
Total Income Tax Expense |  | $ | 924 |  |  | $ | 11,100 |  |  | $ | 11,735 |
Income tax expense | Income tax expense is comprised of the following:
|  | (Thousands of Dollars)
|  | Years Ended December 31,
|  | 2018 |  | 2017 |  | 2016
Current: |  |  |  |  |  |
Federal |  | $ | (188 | ) |  | $ | 2,090 |  |  | $ | 7,305 |
State |  |  | 2,073 |  |  |  | 1,066 |  |  |  | 877 |
Deferred: |  |  |  |  |  |  |  |  |  |  |  |
Federal |  |  | (338 | ) |  |  | 7,713 |  |  |  | 3,325 |
State |  |  | (545 | ) |  |  | 310 |  |  |  | 307 |
Investment Tax Credits |  |  | (78 | ) |  |  | (79 | ) |  |  | (79 | )
Total Income Tax Expense |  | $ | 924 |  |  | $ | 11,100 |  |  | $ | 11,735 |
Deferred tax liability | The components of the net deferred tax liability are as follows:
|  | (Thousands of Dollars)
|  | December 31,
|  | 2018 |  | 2017
Utility Plant Related |  | $ | 44,777 |  |  | $ | 41,259 |
Customer Advances |  |  | (3,702 | ) |  |  | (3,749 | )
Employee Benefits |  |  | 5,490 |  |  |  | 4,903 |
Investment Tax Credits (ITC) |  |  | 596 |  |  |  | 675 |
Other |  |  | 109 |  |  |  | 72 |
Total Deferred Tax Liability and ITC |  | $ | 47,270 |  |  | $ | 43,160 |

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- Definition Tabular disclosure of the components of income tax expense attributable to continuing operations for each year presented including, but not limited to: current tax expense (benefit), deferred tax expense (benefit), investment tax credits, government grants, the benefits of operating loss carryforwards, tax expense that results from allocating certain tax benefits either directly to contributed capital or to reduce goodwill or other noncurrent intangible assets of an acquired entity, adjustments of a deferred tax liability or asset for enacted changes in tax laws or rates or a change in the tax status of the entity, and adjustments of the beginning-of-the-year balances of a valuation allowance because of a change in circumstances that causes a change in judgment about the realizability of the related deferred tax asset in future years. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32639-109319 + Details
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- Definition Tabular disclosure of the components of net deferred tax asset or liability recognized in an entity's statement of financial position, including the following: the total of all deferred tax liabilities, the total of all deferred tax assets, the total valuation allowance recognized for deferred tax assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319 + Details
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- Definition Tabular disclosure of the reconciliation using percentage or dollar amounts of the reported amount of income tax expense attributable to continuing operations for the year to the amount of income tax expense that would result from applying domestic federal statutory tax rates to pretax income from continuing operations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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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