Statement of Shareholders' Equity (USD $) In Thousands	Total	Common Stock [Member]	Additional Paid In Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income [Member]	Noncontrolling Interest [Member]
Balance at Jan. 01, 2011	$ 305,127	$ 180,661	$ 12,336	$ 95,212	$ 2,833	$ 14,085
Balance, shares at Jan. 01, 2011		65,500
Employee Share Purchase Plan And Compensation Grants	169	169	0	0	0	0
Employee Share Purchase Plan And Compensation Grants, shares		29
Exercise of options	44	51	(7)	0	0	0
Exercise of options, shares		10
Stock based compensation	429	0	429	0	0	0
Earnings from continuing operations	6,039	0	0	5,372	0	667
Loss from discontinued operations, net of taxes	(366)	0	0	(291)	0	(75)
Currency translation adjustment	2,058	0	0	0	1,966	92
Change in fair value of interest rate swap, net of income taxes	110	0	0	0	73	37
Balance at Apr. 02, 2011	313,610	180,881	12,758	100,293	4,872	14,806
Balance, shares at Apr. 02, 2011		65,539
Balance at Dec. 31, 2011	314,948	182,108	14,134	100,508	2,382	15,816
Balance, shares at Dec. 31, 2011		65,796
Employee Share Purchase	144	144	0	0	0
Employee Share Purchase Plan And Compensation Grants, shares		32
Exercise of options	13	17	(4)	0	0	0
Exercise of options, shares		7
Stock based compensation	588	0	588	0	0	0
Earnings from continuing operations	6,663	0	0	6,116	0	547
Loss from discontinued operations, net of taxes	(224)	0	0	(224)	0	0
Currency translation adjustment	1,099	0	0	0	1,020	79
Change in fair value of interest rate swap, net of income taxes	(40)	0	0	0	(26)	(14)
Balance at Mar. 31, 2012	$ 323,191	$ 182,269	$ 14,718	$ 106,400	$ 3,376	$ 16,428
Balance, shares at Mar. 31, 2012		65,835