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Additional Financial Statement Information (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 29, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jul. 01, 2017
Apr. 01, 2017
Dec. 31, 2016
Dec. 31, 2018
Dec. 31, 2017
Condensed Balance Sheet Statements, Captions [Line Items]                      
Settlement loss [1] $ 673 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0      
Net proceeds from lease termination [1] 0 $ 0 $ 0 $ 0 0 $ (1,544) $ 0 $ 0      
Monthly deposits as percentage of monthly salary                   8.33%  
Other Liabilities                      
Condensed Balance Sheet Statements, Captions [Line Items]                      
Severance liability $ 7,700       $ 7,800         $ 7,700 $ 7,800
Tianjin, People's Republic of China                      
Condensed Balance Sheet Statements, Captions [Line Items]                      
Net proceeds from lease termination                     $ 1,500
Karmiel, Israel Facility                      
Condensed Balance Sheet Statements, Captions [Line Items]                      
Proceeds from sale of building                 $ 3,700    
Lease term                 5 years    
Gain on sale of building                 $ 1,700    
Current period gain recognized                 800    
Deferred revenue                 $ 900    
Pension Plans | Non-US                      
Condensed Balance Sheet Statements, Captions [Line Items]                      
Settlement loss                   $ 700  
[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 2018 ended on March 31, June 30, September 29, and December 31, respectively. The first, second, third, and fourth quarters of 2017 ended on April 1, July 1, September 30, and December 31, respectively.