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Leases - Real estate costs (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 25, 2019
Jun. 25, 2019
Lease costs    
Operating lease $ 13,486 $ 26,913
Variable lease 403 851
Short-term lease 30 60
Total lease costs $ 13,919 $ 27,824