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Restructuring and Related Charges (Details) - Restructuring accrual activity - USD ($)
$ in Thousands
9 Months Ended
Sep. 26, 2015
Sep. 27, 2014
Restructuring and Related Charges (Details) - Restructuring accrual activity [Line Items]    
Accrual   $ 657
Charges to expense   315
Cash payments   (358)
Accrual   614
Lease Obligations [Member]    
Restructuring and Related Charges (Details) - Restructuring accrual activity [Line Items]    
Accrual $ 480 488
Charges to expense 354
Cash payments $ (360) (242)
Accrual $ 120 600
Severance And Other Termination Costs [Member]    
Restructuring and Related Charges (Details) - Restructuring accrual activity [Line Items]    
Accrual   169
Charges to expense   (39)
Cash payments   (116)
Accrual   $ 14