Debt - Effect of Derivatives on Financial Statements (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 28, 2021	Mar. 29, 2020
Debt and Credit Arrangements
Total net interest expense on Consolidated Statements of Operations	$ (3,647)	$ (3,967)
Weighted average interest rates on debt, including the impact of interest rate swap agreements	3.60%	3.80%
Interest paid, including payments made or received under the swaps	$ 3,400	$ 4,100
Interest rate swap
Debt and Credit Arrangements
Portion of derivative liability that would be reclassified into earnings	11,600
Interest expense \| Interest rate swap
Debt and Credit Arrangements
Amount of Gain or (Loss) Recognized in AOCI/AOCL on Derivative	1,382	(8,408)
Amount of Gain or (Loss) Reclassified from AOCI/AOCL into Income	(1,709)	(330)
Total net interest expense on Consolidated Statements of Operations	3,647	$ 3,967
Portion of derivative liability that would be reclassified into earnings	$ 7,100
Estimate of period of time over which portion of derivative liability would be reclassified into earnings	12 months

The average effective interest rate during the reporting period.

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