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Income Taxes - Summary of significant components of deferred tax assets and liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Deferred tax assets: |  |
Self-insurance | $ 4,773 | $ 5,729
Pension | 8,105 | 9,617
State net operating loss carryforwards | 5,853 | 1,445
Bad debt | 1,302 | 1,392
Stock-based compensation | 2,291 | 3,358
Inventory reserve | 3,226 | 2,478
Impairment reserve | 338 | 2,802
Foreign tax credits carryforwards |  | 3,086
Federal net operating loss carryforwards |  | 19,664
Basis differences in consolidated limited liability company | 486 | 5,778
All others | 1,126 | 2,191
Gross deferred tax assets | 27,500 | 57,540
Deferred tax liabilities: |  |
Depreciation | (33,486) | (87,647)
Goodwill amortization | (6,893) | (6,763)
Basis differences in joint ventures | (448) | (444)
All others | (5) | (5)
Gross deferred tax liabilities | (40,832) | (94,859)
Net deferred tax liabilities | $ (13,332) | $ (37,319)

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