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)