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Stockholders' Equity (Summary Of Assumptions Used To Value Stock Option Grants Using Lattice-Binomial Model) (Details)
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Stockholders' Equity and Stock-based Compensation Disclosure [Abstract]        
Dividend yield 0.00% 0.00% 0.00% 0.00%
Expected volatility, minimum     53.00% 61.00%
Expected volatility 53.00% 61.00%    
Expected volatility, maximum     54.00% 65.00%
Risk free interest rate, minimum     1.87% 1.97%
Risk-free interest rate 1.88% 2.01%    
Risk free interest rate, maximum     1.88% 2.01%
Suboptimal exercise factor, minimum 2.39 2.26 2.33 2.26
Suboptimal exercise factor, maximum 3.61 3.65 3.61 3.65