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Income Taxes - Summary of significant components of deferred tax assets and liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Deferred tax assets: |  |
Self-insurance | $ 3,051 | $ 5,673
Pension | 5,237 | 7,982
State net operating loss carryforwards | 1,960 | 5,558
Allowance for credit losses | 1,757 | 1,692
Stock-based compensation | 2,531 | 2,532
Inventory reserve | 3,290 | 2,868
Lease liability | 6,701 | 5,620
Valuation allowance | (990) | (865)
All others, net | 3,427 | 2,834
Gross deferred tax assets | 26,964 | 33,894
Deferred tax liabilities: |  |
Depreciation | (51,494) | (39,253)
Right of use asset | (6,397) | (5,834)
Goodwill amortization | (6,546) | (6,556)
Gross deferred tax liabilities | (64,437) | (51,643)
Net deferred tax liabilities | $ (37,473) | $ (17,749)

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