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Accounting For Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2019
Income Tax Disclosure [Abstract] |
Schedule of Components of Income Tax Expense |
| 2019 |  | 2018 |  | 2017
Current income tax expense | $ | 16,276 |  |  | $ | 17,490 |  |  | $ | 13,101 |
Deferred income tax expense | 15,098 |  |  | 8,570 |  |  | 69,657 |
Total income tax expense | $ | 31,374 |  |  | $ | 26,060 |  |  | $ | 82,758 |
Schedule of Effective Income Tax Rate Reconciliation |
| 2019 |  | 2018 |  | 2017
Federal income taxes at statutory rates | $ | 47,909 |  | 21.0 | % |  | $ | 34,158 |  | 21.0 | % |  | $ | 69,542 |  | 35.0 | %
Increase (decrease) in tax resulting from: |  |  |  |  |  |  |  |
Tax effect of regulatory treatment of utility plant differences | (9,967 | ) | (4.3 | ) |  | (8,153 | ) | (5.0 | ) |  | 3,482 |  | 1.7 |
State income tax expense | 1,465 |  | 0.6 |  |  | 1,191 |  | 0.7 |  |  | 1,110 |  | 0.6 |
Settlement of prior year tax returns and adjustment of tax reserves | 643 |  | 0.3 |  |  | (140 | ) | (0.1 | ) |  | (384 | ) | (0.2 | )
Manufacturing deduction | — |  | — |  |  | — |  | — |  |  | (1,119 | ) | (0.6 | )
Settlement of equity awards | 612 |  | 0.3 |  |  | (990 | ) | (0.6 | ) |  | (1,439 | ) | (0.7 | )
Acquisition costs | (1,712 | ) | (0.7 | ) |  | 329 |  | 0.2 |  |  | 2,491 |  | 1.3 |
Federal income tax rate change | — |  | — |  |  | — |  | — |  |  | 10,169 |  | 5.1 |
Non-plant excess deferred turnaround | (5,690 | ) | (2.5 | ) |  | — |  | — |  |  | — |  | — |
Tax loss on sale of METALfx | (1,272 | ) | (0.6 | ) |  | — |  | — |  |  | — |  | — |
Valuation allowance | 267 |  | 0.1 |  |  | — |  | — |  |  | — |  | — |
Other | (881 | ) | (0.4 | ) |  | (335 | ) | (0.2 | ) |  | (1,094 | ) | (0.5 | )
Total income tax expense | $ | 31,374 |  | 13.8 | % |  | $ | 26,060 |  | 16.0 | % |  | $ | 82,758 |  | 41.7 | %
Schedule of Deferred Income Tax Assets and Liabilities | The total net deferred income tax liability consisted of the following as of December 31 (dollars in thousands):
| 2019 |  | 2018
Deferred income tax assets: |  |  |
Unfunded benefit obligation | $ | 43,224 |  |  | $ | 45,842 |
Utility energy commodity and interest rate swap derivatives | 8,436 |  |  | 11,724 |
Regulatory deferred tax credits | 6,394 |  |  | 6,244 |
Tax credits | 21,696 |  |  | 21,008 |
Power and natural gas deferrals | 8,624 |  |  | 17,618 |
Deferred compensation | 7,171 |  |  | 5,536 |
Deferred taxes on regulatory liabilities | 101,648 |  |  | 106,909 |
Other | 17,423 |  |  | 16,793 |
Total gross deferred income tax assets | 214,616 |  |  | 231,674 |
Valuation allowances for deferred tax assets | (16,550 | ) |  | (13,651 | )
Total deferred income tax assets after valuation allowances | 198,066 |  |  | 218,023 |
Deferred income tax liabilities: |  |  |
Differences between book and tax basis of utility plant | 525,931 |  |  | 509,789 |
Regulatory asset on utility, property plant and equipment | 86,701 |  |  | 83,141 |
Regulatory asset for pensions and other postretirement benefits | 43,838 |  |  | 47,893 |
Utility energy commodity and interest rate swap derivatives | 8,436 |  |  | 11,724 |
Long-term debt and borrowing costs | 26,552 |  |  | 24,609 |
Settlement with Coeur d’Alene Tribe | 6,250 |  |  | 6,400 |
Other regulatory assets | 20,137 |  |  | 15,318 |
Other | 8,734 |  |  | 6,751 |
Total deferred income tax liabilities | 726,579 |  |  | 705,625 |
Net long-term deferred income tax liability | $ | 528,513 |  |  | $ | 487,602 |

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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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