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Restructuring Costs Restructuring Costs (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2017
[1]
Sep. 30, 2017
[1]
Jul. 01, 2017
[1]
Apr. 01, 2017
[1]
Dec. 31, 2016
[1]
Oct. 01, 2016
[1]
Jul. 02, 2016
[1]
Apr. 02, 2016
[1]
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Restructuring Cost and Reserve [Line Items]                      
Restructuring costs $ 752 $ 423 $ 315 $ 554 $ 271 $ 709 $ 1,011 $ 675 $ 2,044 $ 2,666 $ 4,461
Employee Severance                      
Restructuring Cost and Reserve [Line Items]                      
Restructuring costs                 2,044 2,666 $ 4,461
Global Cost Reduction Program | Costa Rica                      
Restructuring Cost and Reserve [Line Items]                      
Restructuring costs                 100 400  
Global Cost Reduction Program | Other Geographical Locations                      
Restructuring Cost and Reserve [Line Items]                      
Restructuring costs                 600 400  
Global Cost Reduction Program | Europe, Canada and United States                      
Restructuring Cost and Reserve [Line Items]                      
Restructuring costs                 $ 1,300 $ 1,900  
[1] The Company reports interim financial information for the 13-week periods beginning on a Sunday and ending on a Saturday, except for the first fiscal quarter, which always begins on January 1, and the fourth fiscal quarter, which always ends on December 31. The first, second, third, and fourth quarters of 2017 ended on April 1, July 1, September 30, and December 31, respectively. The first, second, third, and fourth quarters of 2016 ended on April 2, July 2, October 1, and December 31, respectively.