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Income Taxes - Deferred Tax Assets Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Income Tax Disclosure [Abstract] |  |
Employee and retiree benefit plans | $ 26,872 | $ 28,097
Capital loss and other carryforwards | 16,316 | 16,035
Operating lease assets | 24,705 | 20,036
Operating lease liabilities | (23,945) | (19,530)
Depreciation and amortization | (188,993) | (175,904)
Inventories | 8,780 | 7,699
Allowances and accruals | 7,343 | 7,765
Interest rate exchange agreement | 745 | 2,113
Other | (16,946) | (14,998)
Total gross deferred tax (liabilities) | (145,123) | (128,687)
Valuation allowance | (16,316) | (16,035)
Total deferred tax (liabilities), net of valuation allowances | $ (161,439) | $ (144,722)

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