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Derivative Instruments Schedule of Derivative Instruments (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Oct. 01, 2016
Sep. 30, 2017
Oct. 01, 2016
Dec. 31, 2016
Derivative [Line Items]          
Derivative Instruments, Gain Recognized in Other Comprehensive Income (Loss), Effective Portion [1]   $ 0 $ 200 $ 0  
Gain (Loss) on Foreign Currency Derivative Instruments Not Designated as Hedging Instruments $ 9 (18) (495) (392)  
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net [2] (39) 0 (58) 0  
Derivative Instruments, Gain (Loss) Recognized in Income, Ineffective Portion and Amount Excluded from Effectiveness Testing, Net [3] 0 $ 0 (5) $ 0  
Designated as Hedging Instrument [Member]          
Derivative [Line Items]          
Derivative, Notional Amount 17,700   17,700   $ 0
Not Designated as Hedging Instrument [Member]          
Derivative [Line Items]          
Derivative, Notional Amount 27,500   27,500   8,100
Accrued Liabilities [Member] | Foreign Exchange Forward [Member]          
Derivative [Line Items]          
Other Derivatives Not Designated as Hedging Instruments at Fair Value, Net 315   315   43
Other Current Assets [Member] | Foreign Exchange Forward [Member]          
Derivative [Line Items]          
Other Derivatives Not Designated as Hedging Instruments at Fair Value, Net 711   711   0
Derivative, Fair Value, Net 138   138   0
Other Current Assets [Member] | Foreign Exchange Option [Member]          
Derivative [Line Items]          
Other Derivatives Not Designated as Hedging Instruments at Fair Value, Net $ 0   $ 0   $ 180
[1] (1)The amount represents the change in fair value of derivative contracts due to changes in spot rates.
[2] (2)The amount represents reclassification from other comprehensive income to earnings that occurs when the hedged item affects earnings.
[3] (3)The amount represents the change in fair value of derivative contracts due to changes in the forward rates. No gains or losses were reclassified as a result of discontinuance of cash flow hedges.