Derivative - Changes in AOCL, net of tax (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 29, 2021	Jun. 30, 2020
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	$ 288,693	$ 571,742
Ending balance	284,608	351,929
Accumulated Other Comprehensive Loss
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	(3,785)	(435)
Ending balance	72	(4,804)
Interest rate swap agreement | Accumulated Other Comprehensive Loss
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	(3,464)	0
Other comprehensive loss before reclassifications	2,514	(4,045)
Amounts reclassified from AOCL	950	208
Other comprehensive loss, net of tax	$ 3,464	(3,837)
Ending balance		$ (3,837)