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Employee Benefit Plans Amounts Recognized on Balance Sheet Table (Details) - Pension Plans, Defined Benefit [Member] - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Defined Benefit Plan Disclosure [Line Items] |  |
Assets for Plan Benefits, Defined Benefit Plan | $ 4,470 | $ 1,690
Defined Benefit Plan, Amounts Recognized in Balance Sheet |  |
Current liabilities | (340) | (330)
Noncurrent liabilities | (8,900) | (7,680)
Net liability recognized at December 31 | $ (4,770) | $ (6,320)

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