Commitments and Contingencies - Operating Lease Liability (Details) - USD ($) $ in Thousands	Jun. 27, 2020	Dec. 31, 2019
Commitments and Contingencies Disclosure [Abstract]
Accrued liabilities - current portion of operating leases	$ 2,718	$ 2,663
Operating leases	12,975	$ 14,337
Operating lease liability	$ 15,693
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List]	us-gaap:AccruedLiabilitiesCurrent