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Stockholders' Equity (Summary Of Assumptions Used To Value Stock Option Grants Using Lattice-Binomial Model) (Details)
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Stockholders' Equity and Stock-based Compensation Disclosure [Abstract]    
Dividend yield 0.00% 0.00%
Expected volatility 48.00% 54.00%
Risk-free interest rate 2.83% 1.87%
Suboptimal exercise factor, minimum 2.66 2.33
Suboptimal exercise factor, maximum 4.07 3.59