Leases - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 27, 2020	Sep. 27, 2020	Dec. 31, 2019
Leases [Abstract]
Operating lease right-of-use assets, net	$ 159,975	$ 159,975	$ 162,184
Operating lease liabilities	161,862	161,862
Operating lease cost	$ 13,800	$ 42,300
Weighted average remaining lease term (in years)	7 years 1 month 6 days	7 years 1 month 6 days
Weighted average discount rate (as a percent)	7.10%	7.10%
Cash payments for operating leases	$ 11,300	$ 32,500