Stockholders' Equity (Narrative) (Details) (USD $)	9 Months Ended
	Sep. 28, 2014	Sep. 29, 2013	Sep. 28, 2014 Repurchase plan authorized in Oct 2008 [Member]	Oct. 17, 2014 Repurchase plan authorized in Oct 2014 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock Repurchase Program, Number of Shares Authorized to be Repurchased (in shares)			6,000,000	3,000,000
Stock Repurchased and Retired During Period, Shares			2,100,000
Costs for repurchase of common stock			$ 68,600,000
Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased			700,000
Pending settlement relating to cost of repurchase of common stock, in USD			2,200,000
Shares Repurchased And Retired Related to Net of Issuances Shares, Shares	50,000	14,000
Payments Related to Tax Withholding for net share settlement	$ 1,634,000	$ 500,000