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Income Taxes - Summary of significant components of deferred tax assets and liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Deferred tax assets: |  |
Self-insurance | $ 5,729 | $ 5,055
Pension | 9,617 | 7,261
State net operating loss carryforwards | 1,445 | 1,663
Bad debt | 1,392 | 1,291
Stock-based compensation | 3,358 | 3,501
Inventory reserve | 2,478 | 2,447
Impairment reserve | 2,802 |
Foreign tax credits carryforwards | 3,086 |
Federal net operating loss carryforwards | 19,664 |
Basis differences in consolidated limited liability company | 5,778 |
All others | 2,191 | 1,690
Valuation allowance | (415) |
Gross deferred tax assets | 57,540 | 22,908
Deferred tax liabilities: |  |
Depreciation | (87,647) | (71,647)
Goodwill amortization | (6,763) | (6,587)
Basis differences in consolidated limited liability company |  | (4,636)
Basis differences in joint ventures | (444) | (408)
All others | (5) | (5)
Gross deferred tax liabilities | (94,859) | (83,283)
Net deferred tax liabilities | $ (37,319) | $ (60,375)

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