Fair Value Measurements And Derivative Instruments Fair Value Measurements And Derivative Instruments (Schedule Of Fair Value Of Derivatives Not Designated As Hedges) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	$ 10	$ 76
Derivative Liability, Fair Value, Gross Liability	188	11
Not Designated as Hedging Instrument [Member] | Foreign Currency Derivatives [Member] | Prepaid Expenses and Other Current Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	10	76
Not Designated as Hedging Instrument [Member] | Foreign Currency Derivatives [Member] | Other Current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability	$ 188	$ 11