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Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Deferred Tax Assets, Gross [Abstract] |  |
Accrued compensation, principally postretirement and other employee benefits | $ 60,797 | $ 62,547
Accrued expenses, principally for state income taxes, interest and warranty | 32,418 | 29,736
Net operating loss and other carryforwards | 319,291 | 269,599
Inventories, principally due to reserves for financial reporting purposes and capitalization for tax purposes | 23,723 | 17,671
Accounts receivable, principally due to allowance for doubtful accounts | 7,118 | 3,409
Accrued insurance | 4,165 | 2,001
Long-term liabilities, principally warranty, environmental and exit costs | 2,273 | 3,305
Deferred Tax Assets, Lease Obligations | 40,984 | 35,473
Total gross deferred tax assets | 490,769 | 423,741
Valuation allowance | (287,679) | (244,153)
Total deferred tax assets | 203,090 | 179,588
Deferred Tax Liabilities, Gross [Abstract] |  |
Intangible assets, principally due to different tax and financial reporting bases and amortization lives | (387,897) | (364,843)
Plant and equipment, principally due to differences in depreciation | (62,667) | (56,401)
Deferred Tax Liabilities, Leasing Arrangements | (38,742) | (34,191)
Deferred Tax Liabilities, Other | 9,992 | (19,716)
Total gross deferred tax liabilities | (479,314) | (475,151)
Deferred Tax Liabilities, Net | (276,224) | (295,563)
Deferred Tax Assets, Net, Classification [Abstract] |  |
Non-current deferred tax asset | 22,199 | 26,473
Non-current deferred tax liability | $ (298,423) | $ (322,036)

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