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Share-Based Compensation (Stock Option Pricing Model To Estimate The Fair Value Of Stock Option Awards) (Details)	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Share-Based Compensation
Risk-free interest rate		2.70%	2.20%	3.10%
Expected life (in years)		6.3	5.2	6.3
Expected volatility		44.70%	44.60%	45.20%
Dividend		0.00%	0.00%	0.00%

The period of time an equity-based award is expected to be outstanding. An equity-based award's expected term is generally determined based on, among other factors, the instrument's contractual term and the effects of employees' expected exercise and post-vesting employment termination behavior.

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