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Share-based Awards (Tables)
3 Months Ended
Mar. 31, 2013
Summary of Stock Option Activity
The following table summarizes option activity for the three months ended March 31, 2013:

   
Options
Outstanding
Number of Shares
   
Weighted
Average
Exercise
Price
   
 
Weighted
Average
Fair Value
   
Weighted
Average
Remaining
 Contractual
Life
 
                         
Outstanding at December 31, 2012
    4,350,631     $ 23.01     $ 9.17        
                               
Granted
    12,450     $ 31.49     $ 11.76        
Exercised
    (256,255 )   $ 18.97     $ 7.71        
Forfeited
    (167,041 )   $ 24.78     $ 9.80        
                               
Outstanding at March 31, 2013
    3,939,785     $ 23.22     $ 9.25       4.52  
                                 
Exercisable at March 31, 2013
    2,390,668     $ 24.32     $ 9.21       3.40  
Summary of Movement in Non-Vested Share Options
The following table summarizes the movement in non-vested share options for the three months ended March 31, 2013:
 
   
Options
Outstanding
Number of Shares
   
Weighted Average
 Exercise Price
   
Weighted Average
 Fair Value
 
                   
Non vested outstanding at December 31, 2012
    2,094,533     $ 22.43     $ 9.17  
                         
Granted
    12,450     $ 31.49     $ 11.76  
Vested
    (455,900 )   $ 25.59     $ 9.90  
Forfeited
    (101,966 )   $ 23.34     $ 8.95  
                         
Non vested outstanding at March 31, 2013
    1,549,117     $ 21.51     $ 8.95  
Weighted Average Fair Values and Assumptions Used
The weighted average fair value of options granted during the periods ended March 31, 2013 and March 31, 2012 was calculated using the Black-Scholes option pricing model.  The weighted average fair values and assumptions used were as follows:

   
Three Months Ended
 
   
March 31,
   
March 31,
 
   
2013
   
2012
 
             
Weighted average fair value
  $ 11.76     $ 8.20  
                 
Assumptions:
               
Expected volatility
    42 %     45 %
Dividend yield
    0 %     0 %
Risk-free interest rate
    0.76 %     0.86 %
Expected life
 
5 years
   
5 years
 
Summary of RSU Activity
The Company has awarded RSU’s to certain key executives of the Group. The following table summarizes RSU activity for the three months ended March 31, 2013:

   
RSU
Outstanding
Number of
Shares
   
 
Weighted
Average
Fair Value
   
Weighted
Average
Remaining
 Contractual
Life
 
                   
Outstanding at December 31, 2012
    496,000     $ 20.26        
                       
Granted
    18,450     $ 31.49        
Ordinary shares issued
    -       -        
Forfeited
    -       -        
                       
Outstanding at March 31, 2013
    514,450     $ 20.66       1.76  
                         
Non-Cash Stock Compensation Expense
Non-cash stock compensation expense for the three months ended March 31, 2013 has been allocated as follows:

   
Three Months Ended
 
   
March
 31,
   
March
 31,
 
   
2013
   
2012
 
   
(In thousands)
 
Direct costs
  $ 1,319     $ 1,340  
Selling, general and administrative
    1,075       1,091  
                 
    $ 2,394     $ 2,431