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Stockholders' Equity (Summary Of Assumptions Used To Value Stock Option Grants Using Lattice-Binomial Model) (Details)
3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Stockholders' Equity Note [Abstract]        
Dividend yield 0.00% 0.00% 0.00% 0.00%
Expected volatility rate 60.00% 52.00%    
Expected volatility rate, minimum     60.00% 51.00%
Expected volatility, maximum     65.00% 52.00%
Risk-free interest rate 1.61% 2.98%    
Risk -free interest rate, minimum     1.61% 2.98%
Risk-free interest rate, maximum     2.01% 3.42%
Suboptimal exercise factor, minimum 2.27 2.26 2.26 2.17
Suboptimal exercise factor, maximum 3.64 3.63 3.65 3.63