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Fair Value Measures (Schedule Of Assets And Liabilities Measured At Fair Value) (Details) - Fair Value, Measurements, Recurring [Member] - USD ($)
$ in Thousands
Apr. 01, 2017
Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Money market funds included in cash equivalents $ 80,749 $ 27,917
Foreign currency contracts included in prepaid expenses and other current assets   4
Foreign currency contracts included in other current liabilities (320)  
Total financial assets and liabilities 80,429 27,921
Fair Value, Inputs, Level 1 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Money market funds included in cash equivalents 80,749 27,917
Total financial assets and liabilities 80,749 27,917
Fair Value, Inputs, Level 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Foreign currency contracts included in prepaid expenses and other current assets   4
Foreign currency contracts included in other current liabilities (320)  
Total financial assets and liabilities $ (320) $ 4