Stockholders' Equity (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		6 Months Ended			0 Months Ended	3 Months Ended
	Jul. 01, 2014	Jul. 02, 2013	Jul. 01, 2014	Jul. 02, 2013	Dec. 31, 2013	Jul. 21, 2014 Subsequent Event [Member]	Jul. 01, 2014 Treasury Stock [Member]	Jul. 31, 2013 Treasury Stock [Member]
Stockholders' Equity
Cash dividends declared per common share (in dollars per share)	$ 0.14	$ 0.12	$ 0.28	$ 0.24		$ 0.165
Increase in cash dividend declared (as a percent)						18.00%
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	41,460,270		41,460,270		38,865,951		41,500,000
Value of shares repurchased since program inception	$ 1,138,660		$ 1,138,660		$ 1,015,473		$ 1,138,700
Shares repurchased during period							500,000
Treasury stock repurchased during period			$ 123,187				$ 24,200