Debt - Long-Term Debt (Details) - USD ($) $ in Thousands	Sep. 27, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Total debt	$ 620,650	$ 772,101
Unamortized discount and debt issuance costs	(13,568)	(22,164)
Total debt, net of discount and debt issuance costs	607,082	749,937
Less current maturities of long-term debt	(23,044)	(22,007)
Total long-term debt, net of current	584,038	727,930
Secured Debt | First Term Loan
Debt Instrument [Line Items]
Total debt	491,867	506,772
Secured Debt | Second Term Loan
Debt Instrument [Line Items]
Total debt	$ 128,783	$ 265,329