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Condensed Consolidated Statement of Stockholders' Equity - USD ($) $ in Thousands	Total	Common Stock [Member]	Capital in Excess of Par Value [Member]	Retained Earnings [Member]	Treasury Stock [Member]	Accumulated Other Comprehensive Items [Member]	Noncontrolling Interest [Member]
Beginning balance (in shares) at Dec. 31, 2016		14,624,159			3,686,532
Beginning balance at Dec. 31, 2016	$ 284,279	$ 146	$ 101,405	$ 321,050	$ (90,335)	$ (49,637)	$ 1,650
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	30,675			30,332			343
Dividends declared	(6,933)			(6,933)
Dividend paid to noncontrolling interest	(882)						(882)
Activity under stock plans (in shares)					(69,694)
Activity under stock plans	2,077		369		$ 1,708
Other comprehensive items	21,671					21,440	231
Ending balance (in shares) at Sep. 30, 2017		14,624,159			3,616,838
Ending balance at Sep. 30, 2017	330,887	$ 146	101,774	344,449	$ (88,627)	(28,197)	1,342
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Adjustments for the adoption of ASC 2014-09 and ASU No. 2016-16 | ASU No. 2014-09 [Member]	119			119
Adjustments for the adoption of ASC 2014-09 and ASU No. 2016-16 | ASU No. 2016-16 [Member]	(75)			(75)
Beginning balance (in shares) at Dec. 30, 2017		14,624,159			3,613,838
Beginning balance at Dec. 30, 2017	332,504	$ 146	103,221	342,893	$ (88,554)	(26,715)	1,513
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	42,478			41,991			487
Dividends declared	(7,326)			(7,326)
Dividend paid to noncontrolling interest	(465)						(465)
Activity under stock plans (in shares)					(96,975)
Activity under stock plans	2,273		(104)		$ 2,377
Other comprehensive items	(11,069)					(11,012)	(57)
Ending balance (in shares) at Sep. 29, 2018		14,624,159			3,516,863
Ending balance at Sep. 29, 2018	$ 358,439	$ 146	$ 103,117	$ 377,602	$ (86,177)	$ (37,727)	$ 1,478

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