Intangible Assets (Amortization Expense by Categories) (Details 1) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 29, 2013	Mar. 30, 2012	Dec. 28, 2012
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Amortization Expense	$ 3,368	$ 3,592
Future Amortization Expense, Remainder of Fiscal Year	9,771
Future Amortization Expense, Year Two	13,364
Future Amortization Expense, Year Three	12,313
Future Amortization Expense, Year Four	10,018
Future Amortization Expense, Year Five	8,895
Future Amortization Expense, after Year Five	28,856
Amortizing intangible assets, net	83,217		87,345
Cost of Sales [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Amortization Expense	1,780	1,895
Selling General And Administrative Expense [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Amortization Expense	1,452	1,561
Research and Development Expense [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Amortization Expense	$ 136	$ 136