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Condensed Consolidated Statements of Shareholders' Equity and Comprehensive Income (USD $)
In Thousands, except Share data, unless otherwise specified
Total
Ordinary Shares
Additional Paid-in Capital
Capital Redemption Reserve
Accumulated Other Comprehensive Income
Retained Earnings
Balance at Dec. 31, 2012 $ 754,575 $ 5,067 $ 237,217 $ 100 $ (8,776) $ 520,967
Balance (in shares) at Dec. 31, 2012   60,287,498        
Comprehensive Income:            
Net income 41,524         41,524
Currency translation adjustment (5,935)       (5,935)  
Currency impact of long term funding (4,172)       (4,172)  
Tax on currency impact of long term funding (227)       (227)  
Unrealized capital gain - investments (205)       (205)  
Total comprehensive income 30,985       (10,539) 41,524
Exercise of share options (in shares)   524,243        
Exercise of share options 10,544 42 10,502      
Issue of restricted share units (in shares)   50,000        
Issue of restricted share units 4   4      
Share issuance costs (59)   (59)      
Non-cash stock compensation expense 5,466   5,466      
Tax benefit on exercise of options 193   193      
Balance at Jun. 30, 2013 $ 801,708 $ 5,109 $ 253,323 $ 100 $ (19,315) $ 562,491
Balance (in shares) at Jun. 30, 2013   60,861,741