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Share-Based Compensation (Stock Option Pricing Model To Estimate The Fair Value Of Stock Option Awards) (Details)	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Share-Based Compensation [Abstract]
Risk-free interest rate	0.80%	2.20%
Expected life (in years)	4.7	5.2
Expected volatility	43.90%	44.60%
Dividend	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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