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Income Taxes - Summary of significant components of deferred tax assets and liabilities (Details 2) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Deferred tax assets: |  |
Self-insurance | $ 5,055 | $ 4,660
Pension | 7,261 | 8,730
State net operating loss carryforwards | 1,663 | 4,048
Bad debt | 1,291 | 1,149
Accrued payroll | 1,416 | 1,117
Stock-based compensation | 3,501 | 3,612
Foreign tax credits | 0 | 3,592
All others | 3,166 | 1,681
Valuation allowance | (445) | (3,994)
Gross deferred tax assets | 22,908 | 24,595
Deferred tax liabilities: |  |
Depreciation | (71,647) | (53,119)
Goodwill amortization | (6,587) | (6,450)
Basis differences in consolidated limited liability company | (4,636) | (4,102)
Basis differences in joint ventures | (408) | (355)
All others | (5) | (6)
Gross deferred tax liabilities | (83,283) | (64,032)
Net deferred tax liabilities | $ (60,375) | $ (39,437)

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