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Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2021
Income Tax Disclosure [Abstract] |
Provision for Income Taxes | The provision for income taxes is comprised of (in thousands):
| Years ended December 31,
| 2021 |  | 2020 |  | 2019
Current: |  |  |  |  |
Federal | $ | 27,011 |  |  | $ | 33,495 |  |  | $ | 14,850 |
State | 10,139 |  |  | 8,918 |  |  | 4,127 |
| 37,150 |  |  | 42,413 |  |  | 18,977 |
Deferred: |  |  |  |  |
Federal | (437) |  |  | (7,177) |  |  | 4,585 |
State | (1) |  |  | (1,298) |  |  | 884 |
| (438) |  |  | (8,475) |  |  | 5,469 |
Total tax expense | $ | 36,712 |  |  | $ | 33,938 |  |  | $ | 24,446 |
Reconciliation Between Effective Tax Rate on Net Income (Loss) and Federal Statutory Tax Rate | The reconciliation between our effective tax rate on net income and the federal statutory rate is as follows (dollars in thousands):
| Years ended December 31,
| 2021 |  | 2020 |  | 2019
Income tax at federal statutory rate | $ | 32,650 |  |  | 21.0 | % |  | $ | 27,547 |  |  | 21.0 | % |  | $ | 19,447 |  |  | 21.0 | %
Stock compensation | (1,567) |  |  | (1.0) | % |  | 331 |  |  | 0.3 | % |  | (255) |  |  | (0.3) | %
Other permanent items | 1,274 |  |  | 0.8 | % |  | 424 |  |  | 0.3 | % |  | 737 |  |  | 0.8 | %
Change in valuation allowance | (922) |  |  | (0.6) | % |  | (207) |  |  | (0.2) | % |  | 276 |  |  | 0.3 | %
Change in uncertain tax positions | (2,867) |  |  | (1.8) | % |  | 65 |  |  | 0.1 | % |  | 67 |  |  | 0.1 | %
State income taxes, net of federal benefit | 8,144 |  |  | 5.2 | % |  | 5,778 |  |  | 4.4 | % |  | 4,174 |  |  | 4.5 | %
Total tax expense | $ | 36,712 |  |  | 23.6 | % |  | $ | 33,938 |  |  | 25.9 | % |  | $ | 24,446 |  |  | 26.4 | %
Net Deferred Tax Asset or Liability | Components of the net deferred tax asset or liability are as follows (in thousands):
| As of December 31,
| 2021 |  | 2020
Deferred Tax Assets |  |  |
Long-term |  |  |
Accrued liabilities and allowances | $ | 10,200 |  |  | $ | 9,106 |
Allowance for doubtful accounts | 979 |  | 987
Inventories | 900 |  | 402
Property and equipment | 333 |  | 280 |
Intangibles | 7,042 |  | 6,582
Net operating loss carryforwards | 1,049 |  | 1,206
Other | 14 |  | 16
Long-term deferred tax assets | 20,517 |  | 18,579
Less: Valuation allowance | (216) |  | (1,263)
Net deferred tax assets | 20,301 |  | 17,316
Deferred Tax Liabilities |  |  |
Long-term |  |  |
Accrued liabilities and allowances | (669) |  | (151)
Property and equipment | (7,629) |  | (4,587)
Intangibles | (6,783) |  | (4,810)
Investment in partnership | (8,271) |  | (6,660)
Other | (793) |  | (650)
Long-term deferred tax liabilities | (24,145) |  | (16,858)
Net deferred tax (liabilities) assets | $ | (3,844) |  |  | $ | 458 |
The above amounts are included in our Consolidated Balance Sheets as follows: |  |  |
Other non-current assets | 975 |  |  | 493 |
Long-term deferred income tax liabilities | (4,819) |  |  | (35) |
Net deferred tax (liabilities) assets | $ | (3,844) |  |  | $ | 458 |
Rollforward of Gross Unrecognized Tax Benefits | A rollforward of the gross unrecognized tax benefits is as follows (in thousands):
Unrecognized tax benefit, January 1, 2019 | $ | 5,349 |
Increase as a result of tax positions taken during the period | 2,866
Decrease as a result of tax positions taken during the period | (2,482)
Decrease as a result of expiring statutes | (16)
Unrecognized tax benefit, December 31, 2019 | $ | 5,717 |
Increase as a result of tax positions taken during the period | 3,822
Decrease as a result of tax positions taken during the period | (2,873)
Increase as a result of expiring statutes | 10
Unrecognized tax benefit, December 31, 2020 | $ | 6,676 |
Increase as a result of tax positions taken during the period | 4,482
Decrease as a result of tax positions taken during the period | (3,999)
Decrease as a result of expiring statutes | (2,857)
Unrecognized tax benefit, December 31, 2021 | $ | 4,302 |

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