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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	Jul. 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	$ 78,170	$ 27,917
Foreign currency contracts included in prepaid expenses and other current assets	58	4
Total financial assets and liabilities	78,228	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	78,170	27,917
Total financial assets and liabilities	78,170	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	58	4
Total financial assets and liabilities	$ 58	$ 4