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Stock-Based Compensation (Assumptions Used In Fair Value Valuation Of Option Awards) (Details)	12 Months Ended
	Dec. 31, 2011 years	Dec. 31, 2010 years	Dec. 31, 2009 years
Stock-Based Compensation [Abstract]
Dividend yield
Risk-free interest rate	2.00%	2.30%	1.70%
Volatility	48.10%	45.20%	35.30%
Expected life (years)	5	5	5

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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