Condensed Consolidated Statements of Comprehensive Income (Unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Apr. 02, 2011
Condensed Consolidated Statements of Comprehensive Income [Abstract]
Net sales	$ 192,385	$ 159,847
Cost of sales	135,712	112,012
Gross profit	56,673	47,835
Operating expenses:
Selling, general and administrative expenses	31,997	25,516
Research and development expenses	3,027	2,317
Total operating expenses	35,024	27,833
Income from operations	21,649	20,002
Other non-operating income and expense:
Interest expense, net	5,774	5,163
Other non-operating expense (income), net	225	(286)
Total other non-operating income and expense	5,999	4,877
Income before income taxes	15,650	15,125
Provision for income taxes	5,134	4,403
Net income	10,516	10,722
Other Comprehensive Income
Foreign currency translation adjustment	5,277	5,420
Total comprehensive income	$ 15,793	$ 16,142
Weighted average shares, basic	26,606	26,487
Weighted average shares, diluted	26,660	26,608
Net income per share:
Basic	$ 0.40	$ 0.40
Diluted	$ 0.39	$ 0.40