Stockholders' Equity (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended			3 Months Ended
	Apr. 01, 2014	Apr. 02, 2013	Dec. 31, 2013	Apr. 01, 2014 Treasury Stock	Jul. 31, 2013 Treasury Stock
Stockholders' Equity
Cash dividends declared per common share (in dollars per share)	$ 0.14	$ 0.12
Stockholders Equity:
Additional number of shares authorized to repurchase					7,500,000
Number of shares authorized to be repurchased					48,500,000
Repurchased shares since program inception	40,931,893		38,865,951
Value of shares repurchased since program inception	$ 1,114,454		$ 1,015,473
Shares repurchased during period				2,100,000
Treasury stock repurchased during period	$ 98,981			$ 99,000