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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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