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Leases - Supplemental balance sheet information (Details)
$ in Thousands
9 Months Ended
Sep. 29, 2019
USD ($)
Leases [Abstract]  
Operating lease liabilities $ 124,526
Cash paid for amounts included in the measurement of lease liabilities within operating cash flows 19,520
Right of use assets obtained in exchange for operating lease obligations $ 34,632
Weighted average remaining lease term 7 years 4 months 24 days
Weighted average discount rate 4.40%
Other current liabilities  
Lessee, Lease, Description [Line Items]  
Current operating lease liabilities $ 20,400