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Fair Value Measurements (Schedule of Assets and Liabilities at Fair Value, Recurring) (Details) - Fair Value, Measurements, Recurring - USD ($) $ in Thousands | Mar. 28, 2020 | Dec. 31, 2019
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets held in rabbi trusts | $ 4,727 | $ 5,169
Level 1 Inputs |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets held in rabbi trusts | 117 | 53
Level 2 Inputs |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets held in rabbi trusts | 4,610 | 5,116
Level 3 Inputs |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets held in rabbi trusts | $ 0 | $ 0

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