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Derivative Financial Instruments (Schedule Of Fair Values Of The Company's Derivative Instruments And The Line Items On The Consolidated Balance Sheets) (Details) - USD ($)
$ in Thousands
Oct. 01, 2017
Dec. 31, 2016
Derivatives, Fair Value [Line Items]    
Gross Amounts of Recognized Assets $ 2,540 $ 8,763
Gross Amounts of Recognized Liabilities 11,749 1,705
Prepaid Expenses And Other Current Assets [Member] | Derivatives Not Designated As Hedging Instruments [Member]    
Derivatives, Fair Value [Line Items]    
Gross Amounts of Recognized Assets 1,184 5,873
Prepaid Expenses And Other Current Assets [Member] | Derivatives Designated As Hedging Instruments [Member]    
Derivatives, Fair Value [Line Items]    
Gross Amounts of Recognized Assets 1,356 2,890
Other Accrued Liabilities [Member] | Derivatives Not Designated As Hedging Instruments [Member]    
Derivatives, Fair Value [Line Items]    
Gross Amounts of Recognized Liabilities 5,547 1,002
Other Accrued Liabilities [Member] | Derivatives Designated As Hedging Instruments [Member]    
Derivatives, Fair Value [Line Items]    
Gross Amounts of Recognized Liabilities $ 6,202 $ 703