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Fair Value Measurements - Fair Value of Liabilities Measured on a Recurring Basis, Unobservable Input Reconciliation (Details)
$ in Thousands
6 Months Ended
Jul. 04, 2015
USD ($)
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Unobservable Input [Roll Forward]  
Balance at beginning of period $ 1,133
Current period expense 2
Currency translation (53)
Balance at end of period $ 1,082