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Leases - Components of Lease Expense (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 28, 2018
Sep. 29, 2017
Sep. 28, 2018
Sep. 29, 2017
Leases [Abstract]        
Operating lease cost $ 1,614 $ 986 $ 3,587 $ 4,292
Variable lease cost 363 229 1,366 705
Sublease income 0 0 0 (1,225)
Total lease costs $ 1,977 $ 1,215 $ 4,953 $ 3,772