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Additional Financial Statement Information (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 28, 2019	Jun. 29, 2019	Mar. 30, 2019	Dec. 31, 2018	Sep. 29, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Condensed Balance Sheet Statements, Captions [Line Items]
Settlement loss		$ 0	$ 0	$ 0	$ (673)	$ 0	$ 0	$ 0
Gain on liquidation of subsidiary									$ 827	$ 0	$ 0
Monthly deposits as percentage of monthly salary									8.33%
Executive severance costs	0	$ 0	$ 611	$ 0	0	$ 0	$ 0	$ 0	$ 611	0	0
Other Liabilities
Condensed Balance Sheet Statements, Captions [Line Items]
Severance liability	$ 8,000				$ 7,700				8,000	7,700
Tianjin, People's Republic of China
Condensed Balance Sheet Statements, Captions [Line Items]
Net proceeds from lease termination											$ 1,500
Pension Plans \| Foreign Plan
Condensed Balance Sheet Statements, Captions [Line Items]
Settlement loss									$ 700
Pension Plans \| United Kingdom
Condensed Balance Sheet Statements, Captions [Line Items]
Settlement loss										$ 700