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Commitments and Contingent Liabilities - Operating Leases (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 25, 2016
Dec. 27, 2015
Dec. 28, 2014
Commitments and Contingencies Disclosure [Abstract]      
Rent expense $ 16,000 $ 16,000 $ 16,000
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]      
2017 11,362    
2018 5,969    
2019 3,487    
2020 3,091    
2021 2,903    
Later years 4,113    
Total minimum lease payments 30,925    
Less: noncancelable subleases (683)    
Total minimum lease payments, net of noncancelable subleases $ 30,242