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Income Taxes - Summary of significant components of deferred tax assets and liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Deferred tax assets:    
Self-insurance $ 5,673 $ 4,773
Pension 7,982 8,105
State net operating loss carryforwards 5,558 5,853
Allowance for credit losses 1,692 1,302
Stock-based compensation 2,532 2,291
Lease liability 5,620 7,125
Inventory reserve 2,868 3,226
Employee retention credit 1,360  
Valuation allowance (865) (546)
All others 1,850 1,763
Gross deferred tax assets 34,270 33,892
Deferred tax liabilities:    
Depreciation (39,253) (33,486)
Right of use asset (5,834) (6,392)
Goodwill amortization (6,556) (6,893)
All others (376) (453)
Gross deferred tax liabilities (52,019) (47,224)
Net deferred tax liabilities $ (17,749) $ (13,332)