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Equity Incentive Schemes and Stock Compensation Charges (Tables)
12 Months Ended
Dec. 31, 2013
Transactions for Company's Share Option Plans
The following table summarizes the transactions for the Company’s share option plans for the years ended December 31, 2013, December 31, 2012 and December 31, 2011:

   
Options Granted
Under Plans
   
Number of
Shares
   
Weighted
Average
Exercise Price
   
Weighted Average Grant
Date Fair
Value
 
Outstanding at December 31, 2010
    4,798,677       4,798,677     $ 21.71     $ 8.47  
Granted
    989,449       989,449     $ 19.66     $ 8.20  
Exercised
    (430,340 )     (430,340 )   $ 10.84     $ 4.80  
Cancelled
    (454,968 )     (454,968 )   $ 25.77     $ 9.87  
Outstanding at December 31, 2011
    4,902,818       4,902,818     $ 21.87     $ 8.61  
Granted
    842,273       842,273     $ 22.01     $ 9.59  
Exercised
    (890,236 )     (890,236 )   $ 14.62     $ 6.16  
Cancelled
    (504,224 )     (504,224 )   $ 25.14     $ 9.76  
Outstanding at December 31, 2012
    4,350,631       4,350,631     $ 23.01     $ 9.17  
Granted
    264,950       264,950     $ 33.09     $ 12.05  
Exercised
    (1,249,759 )     (1,249,759 )   $ 21.60     $ 8.58  
Cancelled
    (392,034 )     (392,034 )   $ 25.27     $ 10.02  
Outstanding at December 31, 2013
    2,973,788       2,973,788     $ 24.20     $ 9.57  
                                 
Vested and exercisable at December 31, 2013
    1,505,707       1,505,707     $ 24.92     $ 8.64  
Non Vested Shares Outstanding
Non vested shares outstanding as at December 31, 2013 are as follows:
 
   
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
    264,950       33.09       12.05  
Vested
    (641,773 )     24.29       9.60  
Forfeited
    (249,629 )     22.97       9.46  
                         
Non vested outstanding at  December  31, 2013
    1,468,081     $ 23.45     $ 9.45  
Information Concerning Outstanding and Exercisable Share Options
The following table summarizes information concerning outstanding and exercisable share options as of December 31, 2013:

  Options Outstanding          
Options Exercisable
 
 
Range
Exercise
Price
   
 
Number of
Shares
   
Weighted
Average
Remaining
Contractual Life
   
Weighted
Average
 Exercise Price
   
 
Number of
Shares
   
Weighted
Average
Exercise Price
 
  $ 11.00     24,140     0.09     $ 11.00     24,140     $ 11.00  
  $ 15.47     180     3.33     $ 15.47     -     $ 15.47  
  $ 15.84     50,000     3.33     $ 15.84     40,000     $ 15.84  
  $ 16.80     150,000     5.83     $ 16.80     60,000     $ 16.80  
  $ 17.17     30,000     5.85     $ 17.17     12,000     $ 17.17  
  $ 18.00     24,000     0.83     $ 18.00     24,000     $ 18.00  
  $ 18.98     6,600     2.87     $ 18.98     6,600     $ 18.98  
  $ 19.45     15,000     4.82     $ 19.45     1,800     $ 19.45  
  $ 20.16     2,000     4.87     $ 20.16     1,200     $ 20.16  
  $ 20.28     457,871     5.17     $ 20.28     177,987     $ 20.28  
  $ 20.59     162,000     6.14     $ 20.59     20,400     $ 20.59  
  $ 21.25     231,751     1.12     $ 21.25     231,751     $ 21.25  
  $ 22.10     400     3.56     $ 22.10     -     $ 22.10  
  $ 22.26     233,927     3.15     $ 22.26     155,161     $ 22.26  
  $ 22.30     475,333     6.32     $ 22.30     82,326     $ 22.30  
  $ 23.66     8,900     6.57     $ 23.66     1,780     $ 23.66  
  $ 24.25     100,000     4.18     $ 24.25     100,000     $ 24.25  
  $ 24.46     343,677     4.17     $ 24.46     172,209     $ 24.46  
  $ 26.20     2,400     4.38     $ 26.20     1,440     $ 26.20  
  $ 26.71     7,650     6.70     $ 26.71     4,090     $ 26.71  
  $ 29.45     3,000     4.32     $ 29.45     1,800     $ 29.45  
  $ 31.49     12,450     7.16     $ 31.49     -     $ 31.49  
  $ 32.37     200,203     7.33     $ 32.37     2,500     $ 32.37  
  $ 35.33     377,523     2.15     $ 35.33     377,523     $ 35.33  
  $ 36.05     6,000     2.40     $ 36.05     6,000     $ 36.05  
  $ 36.22     37,483     7.46     $ 36.22     -     $ 36.22  
  $ 37.90     10,300     7.93     $ 37.90     -     $ 37.90  
  $ 41.25     1,000     2.67     $ 41.25     1,000     $ 41.25  
                                         
  $ 11.00 - $41.25     2,973,788     4.52     $ 24.20     1,505,707     $ 24.92  
Weighted Average Fair Values and Assumptions Used
The weighted average fair values and assumptions were as follows:
 
   
Year Ended
 
   
December 31,
   
December 31,
   
December 31,
 
   
2013
   
2012
   
2011
 
                   
Weighted average fair value
  $ 12.05     $ 9.59     $ 8.20  
                         
Assumptions:
                       
Expected volatility
    40 %     50 %     45 %
Dividend yield
    0 %     0 %     0 %
Risk-free interest rate
    0.76 %     0.83 %     1.4 %
Expected life
 
5.0 years
   
5.0 years
   
5.0 years
 
RSU and PSU Activity
The Company has awarded RSU’s and PSU’s to certain key individuals of the Group. The following table summarizes RSU and PSU activity for the year ended December 31, 2013:

   
PSU
Outstanding
Number of
Shares
   
PSU
Weighted
Average
Fair
Value
 
PSU
Weighted
Average
Remaining
Contractual
Life
 
RSU
Outstanding
Number of
Shares
   
RSU
Weighted
Average
Fair Value
 
RSU
Weighted
Average
Remaining
Contractual
Life
                             
Outstanding at December 31, 2012
    -       -         496,000     $ 20.26    
                                     
Granted
    359,570     $ 33.09         409,492     $ 34.62    
Shares vested
    -       -         (50,000 )   $ 22.30    
Forfeited
    (6,326 )   $ 36.22         (9,033 )   $ 25.53    
                                     
Outstanding at December 31, 2013
    353,244     $ 33.04  
2.35
    846,459     $ 27.05  
1.77
Schedule of Non-cash Stock Compensation Expense
Non-cash stock compensation expense for the year ended December 31, 2013 has been allocated as follows:
 
    Year ended  
   
December 31,
   
December 31,
   
December 31,
 
   
2013
   
2012
   
2011
 
   
(in thousands)
 
Direct costs
  $ 7,835     $ 6,007     $ 5,155  
Selling, general and administrative
  $ 6,385     $ 4,894     $ 4,200  
Restructuring and other non-recurring items (note 14)
    -     $ 620       -  
                         
Total compensation costs
  $ 14,220     $ 11,521     $ 9,355