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Debt (Schedule of Debt Instruments) (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2021 | Dec. 25, 2020
Debt Instrument [Line Items] |  |
Total debt, including current portion | $ 193,489 | $ 172,183
Series B maturing March 2023 |  |
Debt Instrument [Line Items] |  |
Average interest rate | 5.01% |
Debt Instrument, Maturity Date, Description | March 2023 |
Total debt, including current portion |  | 75,000
Series D maturing July 2026 |  |
Debt Instrument [Line Items] |  |
Average interest rate | 5.35% |
Debt Instrument, Maturity Date, Description | July 2026 |
Total debt, including current portion | $ 75,000 | 75,000
Revolving Credit Facility |  |
Debt Instrument [Line Items] |  |
Debt Instrument, Maturity Date, Description | March 2026 |
Total debt, including current portion | $ 0 | 0
Chinese Renminbi Revolving Credit Facility [Member] |  |
Debt Instrument [Line Items] |  |
Average interest rate | 3.52% |
Total debt, including current portion | $ 39,222 | 7,668
Notes payable to banks maturing 2022 |  |
Debt Instrument [Line Items] |  |
Average interest rate | 1.11% |
Debt Instrument, Maturity Date, Description | 2022 |
Total debt, including current portion | $ 4,267 | $ 14,515
Line of Credit | Committed Facility | Federal Funds Effective Swap Rate |  |
Debt Instrument [Line Items] |  |
Debt instrument, basis spread on variable rate | 0.50% |
Line of Credit | Committed Facility | London Interbank Offered Rate (LIBOR) |  |
Debt Instrument [Line Items] |  |
Debt instrument, basis spread on variable rate | 1.50% |
Line of Credit | Committed Facility | Revolving Credit Facility |  |
Debt Instrument [Line Items] |  |
Line of Credit Facility, Current Borrowing Capacity | $ 250,000 |
Line of Credit | Committed Facility | Minimum | Revolving Credit Facility |  |
Debt Instrument [Line Items] |  |
Debt instrument, basis spread on variable rate | 0.00% |
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage | 0.125% |
Line of Credit | Committed Facility | Minimum | Revolving Credit Facility | Cash flow leverage ratio no acquisition |  |
Debt Instrument [Line Items] |  |
Debt Instrument, Covenant Compliance | 1.00 |
Line of Credit | Committed Facility | Minimum | Revolving Credit Facility | Cash flow leverage ratio with acquisitions |  |
Debt Instrument [Line Items] |  |
Debt Instrument, Covenant Compliance | 1.00 |
Line of Credit | Committed Facility | Minimum | Revolving Credit Facility | Interest coverage ratio no acquisitions |  |
Debt Instrument [Line Items] |  |
Debt Instrument, Covenant Compliance | 1.00 |
Line of Credit | Committed Facility | Minimum | Revolving Credit Facility | Interest coverage ratio with acquisitions |  |
Debt Instrument [Line Items] |  |
Debt Instrument, Covenant Compliance | 1.00 |
Line of Credit | Committed Facility | Minimum | Revolving Credit Facility | London Interbank Offered Rate (LIBOR) |  |
Debt Instrument [Line Items] |  |
Debt instrument, basis spread on variable rate | 1.00% |
Line of Credit | Committed Facility | Maximum | Revolving Credit Facility |  |
Debt Instrument [Line Items] |  |
Debt instrument, basis spread on variable rate | 0.75% |
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage | 0.25% |
Line of Credit | Committed Facility | Maximum | Revolving Credit Facility | Cash flow leverage ratio no acquisition |  |
Debt Instrument [Line Items] |  |
Debt Instrument, Covenant Compliance | 3.50 |
Line of Credit | Committed Facility | Maximum | Revolving Credit Facility | Cash flow leverage ratio with acquisitions |  |
Debt Instrument [Line Items] |  |
Debt Instrument, Covenant Compliance | 4.00 |
Line of Credit | Committed Facility | Maximum | Revolving Credit Facility | Interest coverage ratio no acquisitions |  |
Debt Instrument [Line Items] |  |
Debt Instrument, Covenant Compliance | 3.00 |
Line of Credit | Committed Facility | Maximum | Revolving Credit Facility | Interest coverage ratio with acquisitions |  |
Debt Instrument [Line Items] |  |
Debt Instrument, Covenant Compliance | 2.50 |
Line of Credit | Committed Facility | Maximum | Revolving Credit Facility | London Interbank Offered Rate (LIBOR) |  |
Debt Instrument [Line Items] |  |
Debt instrument, basis spread on variable rate | 1.75% |

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