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Shareholders Equity (Tables)
 6 Months Ended
Jun. 30, 2012
Shareholders Equity [Abstract]  
Fair value options, range of assumptions
     
    Range of
Assumptions

Dividend yield

   —  

Expected term (years)

   1.3 – 7.3

Expected volatility

   37% – 78%

Risk-free interest rate

   0.23% – 1.50%