Leases - Supplemental Lease Information (Details) $ in Thousands	3 Months Ended
	Mar. 30, 2019 USD ($)
Leases
Operating lease costs	$ 1,500
Balance Sheet Information
Operating lease right-of-use assets	$ 19,374
Operating lease right-of-use assets, Statement of Financial Position	us-gaap:OtherAssetsNoncurrent
Operating lease liabilities	$ 21,096
Operating lease liabilities, Statement of Financial Position	us-gaap:OtherLiabilitiesCurrent us-gaap:LiabilitiesOtherThanLongtermDebtNoncurrent
Cash Flow Information
Cash paid for amounts included in the measurement of operating lease liabilities	$ 1,671
Right-of-use assets obtained in exchange for operating lease obligations	$ 2,488
Operating Lease Information
Weighted-average remaining lease term	5 years
Weighted-average discount rate	5.22%