Stock Plans and Stock Based Compensation (Stock Based Compensation Expense) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 30, 2013	Mar. 31, 2012
Stock-based compensation expense
Stock-based compensation expense	$ 5,904	$ 5,266
Provision for income taxes	(2,043)	(1,884)
Net income attributable to common shareowners	3,861	3,382
Cost of Sales [Member]
Stock-based compensation expense
Stock-based compensation expense	1,369	1,448
Selling and Administration [Member]
Stock-based compensation expense
Stock-based compensation expense	4,535	3,818
Performance Based Stock Award Program [Member]
Stock-based compensation expense
Stock-based compensation expense	$ 233