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Income Taxes - Summary of significant components of deferred tax assets and liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
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)

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