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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
Jun. 27, 2015
Jun. 28, 2014
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Beginning balance $ 1,855 $ 2,751
Fair value adjustments (407) (298)
Settlements (310) (134)
Ending balance $ 1,138 $ 2,319