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Derivative Financial Instruments (Schedule of Offsetting of Derivative Assets) (Details) - USD ($) $ in Thousands	Sep. 29, 2019	Dec. 31, 2018
Offsetting of Derivative Assets [Line Items]
Gross Amounts of Recognized Assets	$ 343	$ 322
Gross Amounts Offset in the Unaudited Condensed Consolidated Balance Sheets	0	0
Net Amounts Of Assets Presented in the Unaudited Condensed Consolidated Balance Sheets	343	322
Gross Amounts Not Offset in the Unaudited Condensed Consolidated Balance Sheets: Financial Instruments	(56)	(68)
Gross Amounts Not Offset in the Unaudited Condensed Consolidated Balance Sheets: Cash Collateral Pledged	0	0
Net Amount	287	254
HSBC
Offsetting of Derivative Assets [Line Items]
Gross Amounts of Recognized Assets	329	100
Gross Amounts Offset in the Unaudited Condensed Consolidated Balance Sheets	0	0
Net Amounts Of Assets Presented in the Unaudited Condensed Consolidated Balance Sheets	329	100
Gross Amounts Not Offset in the Unaudited Condensed Consolidated Balance Sheets: Financial Instruments	(54)	0
Gross Amounts Not Offset in the Unaudited Condensed Consolidated Balance Sheets: Cash Collateral Pledged	0	0
Net Amount	275	100
Wells Fargo Bank
Offsetting of Derivative Assets [Line Items]
Gross Amounts of Recognized Assets	14	222
Gross Amounts Offset in the Unaudited Condensed Consolidated Balance Sheets	0	0
Net Amounts Of Assets Presented in the Unaudited Condensed Consolidated Balance Sheets	14	222
Gross Amounts Not Offset in the Unaudited Condensed Consolidated Balance Sheets: Financial Instruments	(2)	(68)
Gross Amounts Not Offset in the Unaudited Condensed Consolidated Balance Sheets: Cash Collateral Pledged	0	0
Net Amount	$ 12	$ 154

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