Condensed Consolidated Statements of Income (Unaudited) (USD $) In Thousands, except Per Share data	3 Months Ended		9 Months Ended
	Oct. 01, 2011	Oct. 02, 2010	Oct. 01, 2011	Oct. 02, 2010
Condensed Consolidated Statements of Income [Abstract]
Net sales	$ 177,853	$ 128,930	$ 503,095	$ 389,624
Cost of sales	124,824	90,289	353,821	273,453
Gross profit	53,029	38,641	149,274	116,171
Operating expenses:
Selling, general and administrative expenses	31,577	22,804	84,005	65,991
Research and development expenses	2,801	1,746	7,544	5,156
Restructuring expense		510		2,198
Total operating expenses	34,378	25,060	91,549	73,345
Income from operations	18,651	13,581	57,725	42,826
Other non-operating (income) expense:
Interest expense, net	6,698	4,838	18,014	14,734
Other non-operating (income) expense, net	216	(272)	(668)	750
Total other non-operating (income) expense	6,914	4,566	17,346	15,484
Income before income taxes	11,737	9,015	40,379	27,342
(Benefit from) Provision for income taxes	(403)	2,441	8,600	8,190
Net income	12,140	6,574	31,779	19,152
Consolidated Statement of Comprehensive (loss) income
Minimum pension liability adjustment		(185)		(515)
Foreign currency translation adjustment	(7,008)	12,066	(1,439)	3,223
Comprehensive income	$ 5,132	$ 18,455	$ 30,340	$ 21,860
Weighted average shares, basic	26,546	26,414	26,508	26,364
Weighted average shares, diluted	26,655	26,495	26,712	26,477
Net income per share:
Basic	$ 0.46	$ 0.25	$ 1.20	$ 0.73
Diluted	$ 0.46	$ 0.25	$ 1.19	$ 0.72