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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
Mar. 31, 2018
USD ($)
Apr. 01, 2017
USD ($)
Mar. 31, 2018
EUR (€)
Mar. 31, 2018
GBP (£)
Mar. 31, 2018
USD ($)
Mar. 31, 2018
MXN ($)
Derivative [Line Items]            
Unrealized loss (gain) on derivative instrument $ (1,521) $ (38)        
Not Designated as Hedging Instrument [Member] | Fair Value, Measurements, Recurring [Member]            
Derivative [Line Items]            
Derivative Instruments, Gain (Loss) Recognized in Income, Net (400) (900)        
Not Designated as Hedging Instrument [Member] | Fair Value, Measurements, Recurring [Member] | EUR            
Derivative [Line Items]            
Derivative, Notional Amount     € 12.8   $ 15,200  
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 800 $ 1,800        
Designated as Hedging Instrument [Member] | Fair Value, Measurements, Recurring [Member] | USD            
Derivative [Line Items]            
Derivative, Notional Amount         11,100 $ 214.5
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 $ (200)          
Foreign Currency Cash Flow Hedge Gain Loss To Be Reclassified During Next 12 Months         $ (600)