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Income Taxes | 6 Months Ended
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Jun. 30, 2021
Income Tax Disclosure [Abstract] |
Income Taxes | NOTE 7. IN COME TAXES In accordance with interim reporting requirements, the Company uses an estimated annual effective tax rate for computing its provisions for income taxes. An estimate of annual income tax expense (or benefit) is made each interim period using estimates for annual pre-tax income, income tax adjustments, and tax credits. The estimated annual effective tax rates do not include discrete events such as tax law changes, examination settlements, accounting method changes, or adjustments to tax expense or benefits attributable to prior years. Discrete events are recorded in the interim period in which they occur or become known. The estimated annual tax rate is applied to year-to-date pre-tax income to determine income tax expense (or benefit) for the interim period consistent with the annual estimate. In subsequent interim periods, income tax expense (or benefit) for the period is computed as the difference between the year-to-date amount reported for the previous interim period and the current period’s year-to-date amount. The following table summarizes the significant factors impacting the difference between our effective tax rate and the federal statutory rate for the three and six months ended June 30 (dollars in thousands):
|  | Three months ended June 30, |  |  | Six months ended June 30, |
|  | 2021 |  |  | 2020 |  |  | 2021 |  |  | 2020 |
Federal income taxes at statutory rates |  | $ | 3,459 |  |  |  | 21.0 | % |  | $ | 2,002 |  |  |  | 21.0 | % |  | $ | 20,297 |  |  |  | 21.0 | % |  | $ | 13,963 |  |  |  | 21.0 | %
Increase (decrease) in tax resulting from: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tax effect of regulatory treatment of utility plant differences |  |  | (3,204 | ) |  |  | (19.5 | ) |  |  | (2,415 | ) |  |  | (25.3 | ) |  |  | (6,444 | ) |  |  | (6.7 | ) |  |  | (4,817 | ) |  |  | (7.2 | )
State income tax expense |  |  | 280 |  |  |  | 1.7 |  |  |  | (325 | ) |  |  | (3.4 | ) |  |  | 832 |  |  |  | 0.9 |  |  |  | 902 |  |  |  | 1.4 |
Non-plant excess deferred turnaround (1) |  |  | — |  |  |  | — |  |  |  | (8,390 | ) |  |  | (88.0 | ) |  |  | — |  |  |  | — |  |  |  | (8,476 | ) |  |  | (12.7 | )
Settlement of equity awards |  |  | (21 | ) |  |  | (0.1 | ) |  |  | — |  |  |  | — |  |  |  | 909 |  |  |  | 1.0 |  |  |  | 165 |  |  |  | 0.1 |
Other |  |  | 1,884 |  |  |  | 11.5 |  |  |  | 1,209 |  |  |  | 12.7 |  |  |  | (1,032 | ) |  |  | (1.1 | ) |  |  | (1,124 | ) |  |  | (1.7 | )
Total income tax expense |  | $ | 2,398 |  |  |  | 14.6 | % |  | $ | (7,919 | ) |  |  | (83.0 | )% |  | $ | 14,562 |  |  |  | 15.1 | % |  | $ | 613 |  |  |  | 0.9 | %
(1) In March 2020, the WUTC approved an all-party settlement agreement related to electric tax benefits that were set aside for Colstrip in the 2020 general rate case order. In the approved settlement agreement, the parties agreed to utilize $10.9 million ($8.4 million when tax-effected) of the electric tax benefits to offset costs associated with accelerating the depreciation of Colstrip Units 3 & 4, to reflect a remaining useful life of those units through December 31, 2025. In the second quarter 2020, the Company recorded a one-time increase to depreciation expense with an offsetting decrease to income tax expense.

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- Definition The entire disclosure for income taxes. Disclosures may include net deferred tax liability or asset recognized in an enterprise's statement of financial position, net change during the year in the total valuation allowance, approximate tax effect of each type of temporary difference and carryforward that gives rise to a significant portion of deferred tax liabilities and deferred tax assets, utilization of a tax carryback, and tax uncertainties information. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 21 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32857-109319 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 11.C) -URI http://asc.fasb.org/extlink&oid=116825942&loc=d3e330215-122817 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 17 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32809-109319 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 6.I.5.Q1) -URI http://asc.fasb.org/extlink&oid=116825942&loc=d3e330036-122817 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32705-109319 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 270 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6424409&loc=d3e44925-109338 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -URI http://asc.fasb.org/topic&trid=2144680 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6424122&loc=d3e41874-109331 + Details
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