Stock-Based Compensation (Weighted-Average Assumptions For Option Awards Granted) (Details) (Employee Stock Option [Member])	3 Months Ended			6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010		Jun. 30, 2011	Jun. 30, 2010
Employee Stock Option [Member]
Expected volatility	34.00%		[1]	34.00%	37.00%	[1]
Expected term (in years)	5.3		[1]	5.7	6.4	[1]
Risk-free interest rate	1.90%		[1]	2.10%	2.80%	[1]
Expected dividend yield			[1]			[1]

[1] There were no option awards granted for the three months ended June 30, 2010. Consequently, six month data relates only to the three month period during which options were granted.