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Employee Stock Benefit Plans (Tables)
9 Months Ended
Sep. 30, 2012
Employee Stock Benefit Plans [Abstract]  
Stock option activity under share-based compensation plans
Stock option activity under all of the Company's share-based compensation plans for the nine months ended September 30, 2012 was as follows:
 
   
Number of Options
  
Weighted Average Exercise Price
 
Outstanding, January 1, 2012
  180,718  $19.54 
Granted
  739,000   15.87 
Exercised
  (7,964)  6.78 
Cancelled
  (11,129)  20.25 
Outstanding, September 30, 2012
  900,625  $16.63 
Options exercisable at September 30, 2012
  180,625  $19.48 
 
Weighted average assumptions used to estimate fair value of stock options
The Company uses the Black-Scholes option-pricing model to estimate fair value of grants of stock options with the following weighted-average assumptions:
 
   
Nine Months Ended September 30, 2012
 
Risk-free interest rate
  1.2%
Volatility
  85.53%
Expected dividend yield
  0%
Expected life
 
5.5 years
 
Estimated forfeiture rate
  0%