Debt - Long-Term Debt (Details) - USD ($) $ in Thousands	Sep. 26, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Total debt	$ 893,601	$ 890,000
Other debt	8,051	0
Unamortized discount and debt issuance costs	(21,549)	(23,733)
Total debt, net of discount and debt issuance costs	872,052	866,267
Less current maturities of long-term debt	(7,036)	(5,961)
Total long-term debt, net of current	865,016	860,306
Secured Debt | First Term Loan
Debt Instrument [Line Items]
Total debt	$ 885,550	$ 890,000