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Leases - Real estate leases other information (Details)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 25, 2019
USD ($)
Jun. 25, 2019
USD ($)
lease
Leases    
Cash paid for amounts included in measurement of operating lease liabilities $ 12,166 $ 24,114
Right-of-use assets obtained in exchange for new operating lease liabilities $ 18,532 $ 26,872
Weighted-average remaining lease term 17 years 9 months 29 days 17 years 9 months 29 days
Weighted-average discount rate 6.77% 6.77%
Operating lease not yet taken possession $ 18,300 $ 18,300
Number of finance leases | lease   1
Right-of-use asset 1,800 $ 1,800
Lease liability $ 2,100 $ 2,100