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Leases - Supplemental Balance Sheet Information (Details) - USD ($)
$ in Thousands
Sep. 27, 2020
Dec. 31, 2019
Sep. 29, 2019
Assets      
Lease assets $ 47,599 $ 61,618 $ 55,905
Liabilities      
Accrued liabilities 17,704 19,013 18,421
Lease liabilities 31,225 44,447 39,408
Lease liability $ 48,929 $ 63,460 $ 57,829
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List] us-gaap:AccruedLiabilitiesCurrent