Consolidated Statements of Shareholders' Equity - USD ($)	Total	Common Stock [Member]	Additional Paid In Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income [Member]	Noncontrolling Interest [Member]
Balance at Jan. 02, 2016	$ 426,179,000	$ 297,987,000	$ 22,327,000	$ 106,838,000	$ (6,113,000)	$ 5,140,000
Balance, shares at Jan. 02, 2016		85,418,000
Employee Stock Purchase Plan, Value	200,000	$ 200,000	0	0	0	0
Employee Stock Purchase Plan, Shares		50,000
Exercise of options	523,000	$ 941,000	(418,000)	0	0	0
Exercise of options, shares		143,000
Stock based compensation	1,992,000	$ 0	1,992,000	0	0	0
Earnings (loss) from continuing operations	(13,280,000)	0	0	(13,787,000)	0	507,000
Earnings (loss) from discontinued operations	(834,000)	0	0	(570,000)	0	(264,000)
Currency translation adjustment	(407,000)	0	0	0	(160,000)	(247,000)
Change in Equity Associated with Disposal of Discontinued Operation	(7,148,000)	0	0	0	(5,094,000)	(2,054,000)
Other Comprehensive Income Loss Derivatives Qualifying As Hedges Net Of Tax	0
Balance at Jul. 02, 2016	407,225	$ 299,128	23,901	92,481	(11,367)	3,082
Balance, shares at Jul. 02, 2016		85,611
Balance at Dec. 31, 2016	369,413,000	$ 300,426,000	25,522,000	53,838,000	(13,104,000)	2,731,000
Balance, shares at Dec. 31, 2016		85,744,000
Employee Stock Purchase Plan, Value	182,000	$ 182,000	0	0	0	0
Employee Stock Purchase Plan, Shares		25,000
Exercise of options	3,447,000	$ 6,219,000	(2,772,000)	0	0	0
Exercise of options, shares		698,000
Dividends Cash	(3,894,000)	$ 0	0	(3,894,000)	0	0
Stock based compensation	2,138,000	0	2,138,000	0	0	0
Earnings (loss) from continuing operations	(11,286,000)	0	0	(11,806,000)	0	520,000
Currency translation adjustment	3,495,000	0	0	0	3,502,000	(7,000)
Other Comprehensive Income Loss Derivatives Qualifying As Hedges Net Of Tax	209,000	0	0	0	157,000	52,000
Minority Interest Decrease From Redemptions	0	0	(162,000)	0	(82,000)	244,000
Balance at Jul. 01, 2017	363,704,000	$ 306,827,000	$ 24,726,000	$ 38,138,000	$ (9,527,000)	$ 3,540,000
Balance, shares at Jul. 01, 2017		86,467,000
AOCI Including Portion Attributable To Non controlling Interest Tax	$ 90,000