Leases - Supplemental Cash Flow Information (Details) $ in Thousands	9 Months Ended
	Sep. 29, 2019 USD ($)
Leases
Operating cash flows from finance leases	$ 108
Financing cash flows from finance leases	371
Operating cash flows from operating leases	30,342
Right-of-use assets obtained in exchange for new finance lease liabilities	10,203
Right-of-use assets obtained in exchange for new operating lease liabilities	13,335
Cash received from sublease income	$ 7,196
Weighted-average remaining lease term of finance leases	5 years 10 days
Weighted-average remaining lease term of operating leases	6 years 11 months 23 days
Weighted-average discount rate of finance leases	6.40%
Weighted-average discount rate of operating leases	6.93%