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Stockholders' Equity (Schedule Of Estimated Fair Value Of Option Grant Using Black-Scholes Option Pricing Model) (Details)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Stockholders' Equity [Abstract]
Expected dividend yield	0.00%	0.00%	0.00%
Expected stock price volatility	42.10%	38.80%	36.40%
Risk-free interest rate	2.10%	2.40%	1.80%
Expected life of options (in 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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