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Income Taxes - Deferred Tax Assets And Deferred Tax Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Income Tax Disclosure [Abstract] |  |
Accounts receivable | $ 14,384 | $ 7,063
Inventories | 44,597 | 50,585
Employee benefits | 39,526 | 36,068
Accrued expenses and other | 103,892 | 67,638
Deductible state tax and interest benefit | 4,042 | 3,665
Intangibles | 152,499 | 146,953
Lease liabilities | 91,359 | 86,717
Federal, foreign and state net operating losses and credits | 433,822 | 376,375
Gross deferred tax assets | 884,121 | 775,064
Valuation allowance | (267,838) | (232,196)
Net deferred tax assets | 616,283 | 542,868
Inventories | (17,403) | (12,885)
Plant and equipment | (489,240) | (510,952)
Intangibles | (197,009) | (182,424)
Right of use assets | (87,351) | (83,271)
Prepaids | (56,140) | 0
Other liabilities | (46,121) | (24,220)
Gross deferred tax liabilities | (893,264) | (813,752)
Net deferred tax liability | $ (276,981) | $ (270,884)

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