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Commitments (Schedule of Rent Expense and Sublease Income) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 29, 2017
Dec. 30, 2016
Jan. 01, 2016
Commitments and Contingencies Disclosure [Abstract]      
Gross rental expense $ 6,160 $ 9,676 $ 13,942
less: Sublease income (1,225) (3,553) (5,205)
Net rental expense $ 4,935 $ 6,123 $ 8,737