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Derivative Instruments (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Oct. 01, 2016
Sep. 30, 2017
Oct. 01, 2016
Derivative Instruments, Gain (Loss) [Line Items]        
Derivative Instruments, Loss Recognized in Other Comprehensive Income (Loss), Effective Portion [1] $ (21)      
Derivative Instruments, Gain Recognized in Other Comprehensive Income (Loss), Effective Portion [1]   $ 0 $ 200 $ 0
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
[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.