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Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Deferred Tax Assets, Gross [Abstract] |  |
Accrued compensation, principally postretirement and other employee benefits | $ 72,795 | $ 63,463
Accrued expenses, principally for state income taxes, interest and warranty | 30,159 | 20,400
Net operating loss and other carryforwards | 290,629 | 268,131
Inventories, principally due to reserves for financial reporting purposes and capitalization for tax purposes | 19,228 | 11,659
Accounts receivable, principally due to allowance for doubtful accounts | 5,083 | 6,426
Accrued insurance | 1,897 | 1,264
Long-term liabilities, principally warranty, environmental and exit costs | 4,183 | 5,920
Other assets | (23,533) | (15,467)
Total gross deferred tax assets | 400,441 | 361,796
Valuation allowance | (264,398) | (238,236)
Total deferred tax assets | 136,043 | 123,560
Deferred Tax Liabilities, Gross [Abstract] |  |
Intangible assets, principally due to different tax and financial reporting bases and amortization lives | (394,851) | (406,197)
Plant and equipment, principally due to differences in depreciation | (49,380) | (37,783)
Accounts receivable | (1,704) | (4,654)
Total gross deferred tax liabilities | (445,935) | (448,634)
Deferred Tax Assets, Net, Classification [Abstract] |  |
Non-current deferred tax asset | 29,433 | 23,127
Non-current deferred tax liability | (339,325) | (348,201)
Deferred Tax Liabilities, Net | $ (309,892) | $ (325,074)

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