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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.

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