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Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2023
INCOME TAXES |
Schedule of components of provision (benefit) for income taxes | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Years ended December 31, |  | 2023 |  | 2022 |  | 2021
(in thousands) | ​ |  | ​ | ​ |  | ​ | ​ |  | ​
Current provision (benefit): | ​ |  | ​ | ​ |  | ​ | ​ |  | ​
Federal | ​ | $ | 45,146 | ​ | $ | 47,744 | ​ | $ | 4,946
State | ​ |  | 6,502 | ​ |  | 3,164 | ​ |  | (1,387)
Foreign | ​ |  | 835 | ​ |  | 865 | ​ |  | 784
Deferred provision: | ​ |  | ​ | ​ |  | ​ | ​ |  | ​
Federal | ​ |  | 7,116 | ​ |  | 14,026 | ​ |  | 2,287
State | ​ |  | 1,531 | ​ |  | 5,470 | ​ |  | 2,601
Total income tax provision | ​ | $ | 61,130 | ​ | $ | 71,269 | ​ | $ | 9,231
Schedule of reconciliation between the federal statutory rate and effective tax rate | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Years ended December 31, |  | 2023 |  | 2022 |  | 2021 |
Federal statutory rate | ​ | 21.0 | % | 21.0 | % | 21.0 | %
State income taxes, net of federal benefit | ​ | 2.1 | ​ | 1.9 | ​ | 2.9 |
Foreign taxes, net of federal benefit | ​ | 0.3 | ​ | 0.3 | ​ | 5.1 | ​
Tax credits |  | (0.3) |  | (0.1) |  | (3.5) | ​
Change in contingencies | ​ | 0.1 | ​ | — | ​ | 8.6 | ​
Non-deductible expenses |  | 0.8 |  | 0.7 |  | (2.8) | ​
Adjustments related to CARES Act |  | — |  | — |  | 3.2 | ​
Change in estimated deferred rate |  | — |  | 0.4 |  | 10.2 | ​
Adjustments related to vesting of restricted stock |  | (0.1) |  | 0.2 |  | 7.1 | ​
Other |  | — |  | 0.2 |  | 4.3 | ​
Effective tax rate |  | 23.9 | % | 24.6 | % | 56.1 | %
Schedule of deferred tax assets and liabilities | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
December 31, |  | 2023 |  | 2022
(in thousands) | ​ |  | ​ | ​ |  | ​
Deferred tax assets: |  | ​ |  |  | ​ |
Self-insurance | ​ | $ | 4,303 | ​ | $ | 3,051
Long-term retirement plan | ​ |  | 5,101 | ​ |  | 5,237
State net operating loss carryforwards | ​ |  | 1,520 | ​ |  | 1,960
Allowance for credit losses | ​ |  | 1,634 | ​ |  | 1,757
Stock-based compensation | ​ |  | 1,414 | ​ |  | 2,531
Inventory reserve | ​ | ​ | 3,330 | ​ | ​ | 3,290
Lease liability | ​ | ​ | 5,777 | ​ | ​ | 6,701
Capitalized research and development | ​ | ​ | 3,066 | ​ | ​ | 1,041
Valuation allowance | ​ | ​ | (1,591) | ​ | ​ | (990)
All others, net | ​ |  | 3,126 | ​ |  | 2,386
Gross deferred tax assets | ​ |  | 27,680 | ​ |  | 26,964
Deferred tax liabilities: | ​ |  | ​ | ​ |  | ​
Depreciation | ​ |  | (66,784) | ​ |  | (51,494)
Right of use asset | ​ | ​ | (5,461) | ​ | ​ | (6,397)
Goodwill amortization | ​ |  | (6,725) | ​ |  | (6,546)
Gross deferred tax liabilities | ​ |  | (78,970) | ​ |  | (64,437)
Net deferred tax liabilities | ​ | $ | (51,290) | ​ | $ | (37,473)
Schedule of reconciliation of unrecognized tax benefits | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ | ​ | ​
(in thousands) | ​ | 2023 |  | 2022
Balance at January 1 | ​ | $ | 1,917 | ​ | $ | 1,737
Additions (reductions) based on tax positions related to the current year |  | ​ | 337 |  | ​ | 197
Additions (reductions) for tax positions of prior years |  | ​ | (86) |  | ​ | (17)
Balance at December 31 | ​ | $ | 2,168 | ​ | $ | 1,917

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