Geographic Data (Information Regarding Operations By Geographic Area) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2011	Oct. 01, 2011	Jul. 02, 2011	Apr. 02, 2011	Dec. 31, 2010	Oct. 02, 2010	Jul. 03, 2010	Apr. 03, 2010	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	$ 247,308	$ 253,338	$ 245,541	$ 237,301	$ 234,019	$ 229,807	$ 218,558	$ 211,975	$ 983,488	$ 894,359	$ 738,482
Long-lived assets	97,822				87,093				97,822	87,093	75,072
North America [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales									409,208	394,865	348,342
Long-lived assets	88,382				78,938				88,382	78,938	67,487
Europe, Middle East & Africa [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales									342,578	305,659	256,939
Long-lived assets	5,965				6,566				5,965	6,566	6,035
Latin America [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales									89,715	80,679	60,466
Long-lived assets	362				332				362	332	347
Asia [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales									141,987	113,156	72,735
Long-lived assets	$ 3,113				$ 1,257				$ 3,113	$ 1,257	$ 1,203