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Schedule II Valuation and Qualifying Accounts (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Deferred Tax Valuation Allowance [Member] |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Balance at Beginning of Year | $ 244,153 | $ 264,398 | $ 238,236
Additions | 49,130 | 14,189 | 26,162
Reductions | (5,604) | (34,434) | 0
Balance at End of Year | 287,679 | 244,153 | 264,398
LIFO Reserve [Member] |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Balance at Beginning of Year | 11,428 | 20,020 | 17,571
Charged to Cost and Expense | 357 | 491 | 3,474
Reductions | (4,636) | (9,083) | (1,025)
Balance at End of Year | $ 7,149 | $ 11,428 | $ 20,020

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