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Income Taxes | 12 Months Ended
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Dec. 31, 2021
Income Tax Disclosure [Abstract] |
Income Taxes | INCOME TAXES Income tax expense consisted of the following (in thousands):
| Years Ended December 31,
| 2021 |  | 2020 |  | 2019
Current: |  |  |  |  |
Federal | $ | 42,049 |  |  | $ | 53,297 |  |  | $ | 29,102 |
State | 12,787 |  |  | 12,106 |  |  | 9,547 |
Foreign | 213 |  |  | 446 |  |  | (88) |
| 55,049 |  |  | 65,849 |  |  | 38,561 |
Deferred: |  |  |  |  |
Federal | 27,593 |  |  | (8,988) |  |  | 15,094 |
State | 1,895 |  |  | (1,245) |  |  | 1,307 |
| 29,488 |  |  | (10,233) |  |  | 16,401 |
Total income tax expense | $ | 84,537 |  |  | $ | 55,616 |  |  | $ | 54,962 |
The effective income tax rate differs from the federal corporate tax rate of 21% in 2021, 2020, and 2019 as follows (in thousands):
| Years Ended December 31,
| 2021 |  | 2020 |  | 2019
Tax at statutory rate | $ | 72,663 |  |  | $ | 47,186 |  |  | $ | 46,600 |
State income taxes, net of federal tax benefits | 11,599 |  |  | 8,580 |  |  | 8,575 |
Other, net (1) | 275 |  |  | (150) |  |  | (213) |
Total income tax expense | $ | 84,537 |  |  | $ | 55,616 |  |  | $ | 54,962 |
(1) Prior year amounts within the table have been reclassified to conform to current year presentation. At December 31, deferred income tax assets and liabilities consisted of the following (in thousands):
| December 31,
| 2021 |  | 2020
Deferred income tax assets: |  |  |
Insurance and claims accruals | $ | 55,233 |  |  | $ | 54,913 |
Compensation-related accruals | 12,203 |  |  | 16,054 |
Allowance for uncollectible accounts | 3,958 |  |  | 4,070 |
Operating lease liabilities (1) | 7,033 |  |  | 2,530 |
Other (1) | 1,644 |  |  | 2,844 |
Gross deferred income tax assets | 80,071 |  |  | 80,411 |
Deferred income tax liabilities: |  |  |
Property and equipment | 305,002 |  |  | 308,145 |
Investments in equity securities | 10,985 |  |  | — |
Prepaid expenses | 7,269 |  |  | 6,333 |
Operating lease right-of-use assets (1) | 6,955 |  |  | 2,485 |
Investment in partnership | 17,076 |  |  | — |
Other (1) | 1,283 |  |  | 1,318 |
Gross deferred income tax liabilities | 348,570 |  |  | 318,281 |
Net deferred income tax liability | $ | 268,499 |  |  | $ | 237,870 |
(1) Prior year amounts within the table have been reclassified to conform to current year presentation. Deferred income tax assets are more likely than not to be realized as a result of future taxable income and reversal of deferred income tax liabilities. We recognized a $49 thousand increase in the net liability for unrecognized tax benefits for the year ended December 31, 2021, and a $141 thousand decrease for the year ended December 31, 2020. We accrued interest expense of $0.1 million during 2021 and 2020, excluding from both years the reversal of accrued interest related to the adjustment of uncertain tax positions. If recognized, $1.9 million and $1.8 million of unrecognized tax benefits as of December 31, 2021 and 2020, respectively, would impact our effective tax rate. Interest of $0.4 million as of December 31, 2021 and 2020 has been reflected as a component of the total liability. We expect no other significant increases or decreases for uncertain tax positions during the next 12 months. The reconciliations of beginning and ending gross balances of unrecognized tax benefits for 2021 and 2020 are shown below (in thousands).
| December 31,
| 2021 |  | 2020
Unrecognized tax benefits, beginning balance | $ | 2,363 |  |  | $ | 2,541 |
Gross increases – tax positions in prior period | 65 |  |  | 92 |
Gross increases – current period tax positions | 320 |  |  | 220 |
Settlements | (323) |  |  | (490) |
Unrecognized tax benefits, ending balance | $ | 2,425 |  |  | $ | 2,363 |
We file U.S. federal income tax returns, as well as income tax returns in various states and several foreign jurisdictions. The years 2018 and forward are open for examination by the U.S. Internal Revenue Service (“IRS”), and various years are open for examination by state and foreign tax authorities. State and foreign jurisdictional statutes of limitations generally range from three to four years.

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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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