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Income Taxes | 12 Months Ended
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Dec. 31, 2021
Income Tax Disclosure [Abstract] |
Income Taxes | Income TaxesOn March 27, 2020, the Coronavirus Aid, Relief and Economic Security Act (the “CARES Act”) was signed into law. The CARES Act includes several provisions for corporations including payroll tax credits, deferment of employer social security tax payments, expanded net operating loss carryback periods, accelerated alternative minimum tax credit refunds, modifications to the net interest deduction limitations, and technical corrections to tax depreciation methods for qualified improvement property. The CARES Act did not have a material impact on the Company's income tax provision in the year ended December 31, 2021 and 2020. The provision for income tax expense is summarized as follows for the years ended December 31:
In Thousands | 2021 |  | 2020 |  | 2019
Current: |  |  |  |  |
Federal | $ | 143,392 |  |  | $ | 14,277 |  |  | $ | 12,675 |
State | 12,319 |  |  | 2,024 |  |  | 1,549 |
Deferred: |  |  |  |  |
Federal | 2,132 |  |  | 6,285 |  |  | 3,260 |
State | 132 |  |  | 143 |  |  | 115 |
Total income tax expense | $ | 157,975 |  |  | $ | 22,729 |  |  | $ | 17,599 |
The differences between the provision for income taxes and income taxes computed using the federal income tax rate are as follows for the years ended December 31:
In Thousands | 2021 |  | 2020 |  | 2019
Amount computed using the statutory rate | $ | 146,873 |  |  | $ | 20,747 |  |  | $ | 15,903 |
State income taxes, net of federal tax benefit | 9,836 |  |  | 1,732 |  |  | 1,314 |
Other | 1,266 |  |  | 250 |  |  | 382 |
Total income tax expense | $ | 157,975 |  |  | $ | 22,729 |  |  | $ | 17,599 |
The tax effect of each type of temporary difference giving rise to the net deferred tax liability at December 31 is as follows:
In Thousands | 2021 |  | 2020
Depreciation | $ | (42,966) |  |  | $ | (35,869) |
Inventory | 423 |  |  | 503 |
Allowance for credit losses | 856 |  |  | 499 |
Uniform capitalization rules | 729 |  |  | 276 |
Stock-based compensation | 5,032 |  |  | 1,228 |
Other | (175) |  |  | (474) |
Net deferred income tax liability | $ | (36,101) |  |  | $ | (33,837) |
The Company's inventory costing method for federal income tax purposes differs from the method allowed by GAAP. Both methods of inventory costing result in the same recovery of inventory. However, the timing of the recovery varies. As of December 31, 2021 the Company's tax inventory exceeds its book inventory, which created a deferred tax asset of $0.4 million. The Company made income tax payments of $155.5 million in 2021, $14.1 million in 2020 and $16.4 million in 2019. The Company’s federal income tax returns for the years subsequent to December 31, 2016 remain subject to examination. The Company’s income tax returns in major state income tax jurisdictions remain subject to examination for various periods subsequent to December 31, 2016. The Company has no reserves for uncertain tax positions as of December 31, 2021 and 2020. Interest and penalties resulting from audits by tax authorities have been immaterial and are included in the provision for income taxes in the statements of income.

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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=121826272&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=122134291&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=121826272&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=122134291&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=121826272&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 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -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=120395691&loc=d3e23780-122690 + Details
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