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Significant Accounting Policies (Schedule Of Stock Option Granted Assumptions) (Details)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Significant Accounting Policies [Abstract]      
Dividend yield 0.00% 0.00% 0.00%
Volatility, minimum 40.00% 37.00% 41.00%
Volatility, maximum 64.00% 60.00% 66.00%
Risk free interest, minimum 0.10% 0.10% 0.25%
Risk free interest, maximum 2.30% 3.48% 3.90%
Early exercise multiple, minimum 1.55 1.85 2.0
Early exercise multiple, maximum 1.85 2.60 2.50