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Leases - Total lease costs (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 27, 2019
Jun. 27, 2019
Finance lease costs:    
Amortization of finance lease assets $ 971 $ 1,862
Interest on lease liabilities 292 586
Total finance lease costs 1,263 2,448
Operating lease costs    
Operating lease costs 6,326 11,366
Variable lease cost 542 795
Short-term lease cost 10 120
Total operating lease costs $ 6,878 $ 12,281