Condensed Consolidated Statements of Income (Unaudited) (USD $) In Thousands, except Per Share data	3 Months Ended		6 Months Ended
	Jul. 02, 2011	Jul. 03, 2010	Jul. 02, 2011	Jul. 03, 2010
Condensed Consolidated Statements of Income [Abstract]
Net sales	$ 165,395	$ 132,988	$ 325,242	$ 260,694
Cost of sales	116,985	92,861	228,997	183,164
Gross profit	48,410	40,127	96,245	77,530
Operating expenses:
Selling, general and administrative expenses	26,912	22,215	52,428	43,187
Research and development expenses	2,426	1,631	4,743	3,410
Restructuring expense		642		1,688
Total operating expenses	29,338	24,488	57,171	48,285
Income from operations	19,072	15,639	39,074	29,245
Other non-operating (income) expense:
Interest expense, net	6,153	4,956	11,316	9,896
Other non-operating (income) expense, net	(599)	727	(885)	1,022
Total other non-operating (income) expense	5,554	5,683	10,431	10,918
Income before income taxes	13,518	9,956	28,643	18,327
Provision for income taxes	4,600	3,117	9,003	5,749
Net income	8,918	6,839	19,640	12,578
Consolidated Statement of Comprehensive (loss) income
Minimum pension liability adjustment		(343)		(343)
Foreign currency translation adjustment	(149)	(5,187)	5,569	(8,833)
Comprehensive income	$ 8,769	$ 1,309	$ 25,209	$ 3,402
Weighted average shares, basic	26,491	26,362	26,491	26,349
Weighted average shares, diluted	26,613	26,487	26,657	26,465
Net income per share:
Basic	$ 0.34	$ 0.26	$ 0.74	$ 0.48
Diluted	$ 0.34	$ 0.26	$ 0.74	$ 0.48