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Fair Value Measurements (Fair Value Measurements - Liabilities Measured on Recurring Basis Unobservable Input Reconciliation) (Details) - USD ($)
$ in Thousands
6 Months Ended
Jul. 01, 2017
Jun. 25, 2016
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Beginning balance $ 200 $ 584
Fair value adjustments (144) (177)
Settlements 0 (97)
Ending balance $ 56 $ 310