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Derivative Financial Instruments and Fair Value Measurements (Foreign Forward Currency Contracts Narrative) (Details)
$ in Thousands, € in Millions, £ in Millions, $ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
USD ($)
Jul. 01, 2017
USD ($)
Jun. 30, 2018
USD ($)
Jul. 01, 2017
USD ($)
Jun. 30, 2018
EUR (€)
Jun. 30, 2018
GBP (£)
Jun. 30, 2018
USD ($)
Jun. 30, 2018
MXN ($)
Derivative [Line Items]                
Unrealized loss (gain) on derivative instrument $ 2,764 $ 1,267 $ 1,243 $ 1,229        
Not Designated as Hedging Instrument [Member] | Fair Value, Measurements, Recurring [Member]                
Derivative [Line Items]                
Derivative Instruments, Gain (Loss) Recognized in Income, Net 1,100 (2,000) 1,400 (2,900)        
Not Designated as Hedging Instrument [Member] | Fair Value, Measurements, Recurring [Member] | EUR                
Derivative [Line Items]                
Derivative, Notional Amount         € 13.6   $ 16,500  
Not Designated as Hedging Instrument [Member] | Fair Value, Measurements, Recurring [Member] | GBP                
Derivative [Line Items]                
Derivative, Notional Amount         € 0.4 £ 0.4    
Designated as Hedging Instrument [Member] | Fair Value, Measurements, Recurring [Member]                
Derivative [Line Items]                
Unrealized loss (gain) on derivative instrument (300) 200 500 2,000        
Designated as Hedging Instrument [Member] | Fair Value, Measurements, Recurring [Member] | USD                
Derivative [Line Items]                
Derivative, Notional Amount             3,500 $ 69.4
Designated as Hedging Instrument [Member] | Fair Value, Measurements, Recurring [Member] | Reclassification Out Of Accumulated Other Comprehensive Income Member                
Derivative [Line Items]                
Foreign Currency Cash Flow Hedge Gain Loss Reclassified To Earnings Net $ 300 800 $ 200 800        
Gain Loss On Components Excluded From Assessment Of Foreign Currency Cash Flow Hedge Effectiveness   $ 900   $ 900        
Foreign Currency Cash Flow Hedge Gain Loss To Be Reclassified During Next 12 Months             $ 0