Leases - Supplemental Lease Information (Details) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 28, 2019 USD ($)	Sep. 28, 2019 USD ($)
Leases
Operating lease costs	$ 1,400	$ 4,400
Balance Sheet Information
Operating lease right-of-use assets	17,276	17,276
Operating lease liabilities	$ 18,465	18,465
Cash Flow Information
Cash paid for operating lease liabilities		4,563
Right-of-use assets obtained in exchange for operating lease obligations		$ 2,488
Operating Lease Information
Weighted-average remaining lease term	4 years 8 months 12 days	4 years 8 months 12 days
Weighted-average discount rate	5.25%	5.25%