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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 19,045         19,045
Currency translation adjustment (9,537)       (9,537)  
Currency impact of long term funding (3,409)       (3,409)  
Tax on currency impact of long term funding (183)       (183)  
Unrealized capital gain - investments (7)       (7)  
Total comprehensive income 5,909       (13,136) 19,045
Exercise of share options (in shares)   256,255        
Exercise of share options 4,862 21 4,841      
Issue of ordinary shares                  
Share issuance costs (59)   (59)      
Non-cash stock compensation expense 2,394   2,394      
Tax benefit on exercise of options 251   251      
Balance at Mar. 31, 2013 $ 767,932 $ 5,088 $ 244,644 $ 100 $ (21,912) $ 540,012
Balance (in shares) at Mar. 31, 2013   60,543,753