Stockholders' Equity (Details 5) (USD $)	3 Months Ended
	Mar. 31, 2012	Apr. 02, 2011
Performance share activity
Restricted shares/units, Vested
Weighted Average Grant Date Fair Value, Vested
Performance Shares [Member]
Performance share activity
Unvested as of December 31, 2011	154,500
Performance Shares, Granted	55,557	80,050
Performance Shares, Forfeited	(1,450)
Unvested as of March 31, 2012 (a)	208,607
Weighted Average Grant Date Fair Value, Unvested as of December 31, 2011	$ 49.65
Weighted Average Grant Date Fair Value, Granted	$ 56.54
Weighted Average Grant Date Fair Value, Forfeited	$ 55.57
Weighted Average Grant Date Fair Value, Unvested as of March 31, 2012	$ 51.44