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Note 14. Stock-Based Compensation (Tables)
6 Months Ended
Jun. 30, 2012
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block]
         
Options Outstanding
 
                     
Weighted-Average
       
                     
Remaining
       
   
Shares Available
         
Weighted-Average
   
Contractual
   
Aggregate
 
   
for Grant
   
Number of Shares
   
Exercise Price
   
Life in Years
   
Intrinsic Value
 
Balance - December 31, 2011
    1,004       7,503     $ 6.82              
Options authorized
    2,457       -       -              
Options granted
    (664 )     664       16.16              
Options exercised
    -       (1,291 )     1.95              
Options forfeited
    126       (126 )     19.20              
Options expired
    4       (4 )     15.25              
Restricted stock units granted
    (453 )     -       -              
Restricted stock units forfeited
    33       -       -              
Balance - June 30, 2012
    2,507       6,746       8.43       8.3     $ 45,454  
                                         
Vested and exercisable - June 30, 2012
      1,453       6.24       7.7       13,230  
                                         
Vested and expected to vest - June 30, 2012
      5,975       8.31       8.3       41,146  
Schedule of Nonvested Restricted Stock Units Activity [Table Text Block]
         
Weighted-Average
  Aggregate
   
Number of Shares
   
Grant Date Fair Value
 
Intrinsic Value
Non-vested units - December 31, 2011
    179     $ 25.15      
Granted
    453        16.06      
Vested
    (63 )      24.71      
Forfeited
    (33 )      18.02      
Non-vested units - June 30, 2012
    536        17.96   $ 9,628
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
   
Three Months Ended June 30,
   
Six Months Ended June 30,
 
   
2012
   
2011
   
2012
   
2011
 
Dividend yield
    - %     - %     - %     - %
Risk-free rate
    0.91 %     2.38 %     1.11 %     2.58 %
Expected volatility
    62 %     58 %     61 %     58 %
Expected term - in years
    5.6       5.9       6.0       6.5  
                                 
Grant date fair value
  $ 8.74     $ 11.26     $ 9.02     $ 7.41