Stock-Based Compensation (Assumptions Used To Value Option Grants) (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Employee Stock Option [Member]
Expected volatility factor	43.00%	50.00%
Approximate risk free interest rate	0.52%	0.64%
Expected term (in years)	3 years 10 months 28 days	3 years 3 months 7 days	3 years 10 months 28 days	3 years 3 months 7 days
Expected dividend yield	0.00%	0.00%	0.00%	0.00%
Employee Stock Option [Member] | Minimum [Member]
Expected volatility factor			38.00%	38.00%
Approximate risk free interest rate			0.52%	0.64%
Employee Stock Option [Member] | Maximum [Member]
Expected volatility factor			43.00%	50.00%
Approximate risk free interest rate			0.68%	1.10%
Market and Service Condition Stock Units [Member]
Approximate risk free interest rate			0.47%
Expected term (in years)			2 years 9 months
Expected dividend yield			0.00%
Market and Service Condition Stock Units [Member] | Minimum [Member]
Expected volatility factor			21.00%
Market and Service Condition Stock Units [Member] | Maximum [Member]
Expected volatility factor			39.00%