Employee Stock And Savings Plans (Summary Of Restricted Stock Unit Activity) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2011
Employee Stock And Savings Plans [Abstract]
Shares, Restricted stock units, Beginning balance	1,080
Shares, Granted	567
Shares, Forfeited	(183)
Shares, Vested	(294)
Shares, Restricted stock unit, Ending balance	1,170
Weighted-Average Grant Date Fair Value, Restricted stock unit, Beginning balance	$ 43.49
Weighted-Average Grant Date Fair Value, Granted	$ 58.45
Weighted-Average Grant Date Fair Value, Forfeited	$ 47.27
Weighted-Average Grant Date Fair Value, Vested	$ 45.16
Weighted-Average Grant Date Fair Value, Restricted stock unit, Ending balance	$ 49.56