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Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2020
Income Tax Disclosure [Abstract] |
Components of Income Tax Expense (Benefit) | Components of current and deferred income tax expense (benefit) are as follows ($000’s omitted):
| 2020 |  | 2019 |  | 2018
Current expense (benefit) |  |  |  |  |
Federal | $ | 159,677 |  |  | $ | 196,186 |  |  | $ | (44,462) |
State and other | 24,580 |  |  | 21,252 |  |  | 7,202 |
| $ | 184,257 |  |  | $ | 217,438 |  |  | $ | (37,260) |
Deferred expense (benefit) |  |  |  |  |
Federal | $ | 116,484 |  |  | $ | 74,700 |  |  | $ | 271,544 |
State and other | 21,114 |  |  | 30,738 |  |  | 91,233 |
| $ | 137,598 |  |  | $ | 105,438 |  |  | $ | 362,777 |
Income tax expense (benefit) | $ | 321,855 |  |  | $ | 322,876 |  |  | $ | 325,517 |
Effective Income Tax Rate Reconciliation | The following table reconciles the statutory federal income tax rate to the effective income tax rate:
| 2020 |  | 2019 |  | 2018
Income taxes at federal statutory rate | 21.0 | % |  | 21.0 | % |  | 21.0 | %
State and local income taxes, net of federal tax | 3.3 |  |  | 3.7 |  |  | 4.0 |
Tax accounting method change | — |  |  | — |  |  | (2.5) |
Federal tax credits | (4.8) |  |  | (0.2) |  |  | (0.4) |
Changes in tax laws, including the Tax Act | — |  |  | 0.2 |  |  | 1.0 |
Deferred tax asset valuation allowance | (0.8) |  |  | (0.4) |  |  | 0.9 |
Other | (0.1) |  |  | (0.2) |  |  | 0.2 |
Effective rate | 18.6 | % |  | 24.1 | % |  | 24.2 | %
Deferred Tax Assets and Liabilities | Components of our net deferred tax asset are as follows ($000’s omitted):
| At December 31,
| 2020 |  | 2019
Deferred tax assets: |  |  |
Accrued insurance | $ | 135,703 |  |  | $ | 142,515 |
Inventory valuation reserves | 78,518 |  |  | 97,585 |
Other | 58,686 |  |  | 64,373 |
NOL carryforwards: |  |  |
Federal | — |  |  | 12,962 |
State | 184,046 |  |  | 200,710 |
Tax credits | 5,344 |  |  | 8,648 |
| 462,297 |  |  | 526,793 |
Deferred tax liabilities: |  |  |
Deferred income | (313,170) |  |  | (228,186) |
Intangibles and other | (46,595) |  |  | (44,547) |
| (359,765) |  |  | (272,733) |
Valuation allowance | (69,813) |  |  | (83,953) |
Net deferred tax asset | $ | 32,719 |  |  | $ | 170,107 |
Summary of Income Tax Contingencies | A reconciliation of the change in the unrecognized tax benefits is as follows ($000’s omitted):
| 2020 |  | 2019 |  | 2018
Unrecognized tax benefits, beginning of period | $ | 40,300 |  |  | $ | 30,554 |  |  | $ | 48,604 |
Increases related to positions taken during a prior period | — |  |  | 2,376 |  |  | 5,389 |
Decreases related to positions taken during a prior period | (12,981) |  |  | (7,918) |  |  | (31,850) |
Increases related to positions taken during the current period | 11,001 |  |  | 16,332 |  |  | 8,411 |
Decreases related to settlements with taxing authorities | (7,465) |  |  | (1,044) |  |  | — |
Unrecognized tax benefits, end of period | $ | 30,855 |  |  | $ | 40,300 |  |  | $ | 30,554 |

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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 for tax positions taken in the tax returns filed or to be filed for which it is more likely than not that the tax position will not be sustained upon examination by taxing authorities and other income tax contingencies. Includes, but is not limited to, interest and penalties, reconciliation of unrecognized tax benefits, unrecognized tax benefits that would affect the effective tax rate, tax years that remain subject to examination by tax jurisdictions, and information about positions for which it is reasonably possible that amounts unrecognized will significantly change within 12 months. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -URI http://asc.fasb.org/extlink&oid=84230637&loc=SL6600010-109319 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32718-109319 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 19 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32840-109319 + Details
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