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Condensed Consolidated Statements of Shareholders' Equity and Comprehensive Income - 9 months ended Sep. 30, 2016 - USD ($)
$ in Thousands
Total
Ordinary Shares
Additional Paid-in Capital
Capital Redemption Reserve
Accumulated Other Comprehensive Income
Retained Earnings
Balance (in shares) at Dec. 31, 2015 54,958,912 [1] 54,958,912        
Balance at Dec. 31, 2015 $ 763,096 [1] $ 4,679 $ 383,395 $ 715 $ (61,636) $ 435,943
Comprehensive Income:            
Net income 187,917         187,917
Currency translation adjustment (3,664)       (3,664)  
Currency impact of long term funding 750       750  
Tax on currency impact of long term funding 389       389  
Unrealized capital gain - investments 322       322  
Amortization of interest rate hedge (693)       (693)  
Total comprehensive income 185,021       (2,896) 187,917
Exercise of share options (in shares)   268,713        
Exercise of share options 7,203 $ 18 7,185      
Issue of restricted/performance share units (in shares)   600,088        
Issue of restricted/performance share units 40   40      
Share issuance costs (16)   (16)      
Non-cash stock compensation expense 31,135   31,135      
Tax benefit on exercise of options $ 5,381   5,381      
Balance (in shares) at Sep. 30, 2016 55,827,713 55,827,713        
Balance at Sep. 30, 2016 $ 991,860 $ 4,697 $ 427,120 $ 715 $ (64,532) $ 623,860
[1] The December 31, 2015 Balance Sheet has been retrospectively restated as required to reflect the requirements of new guidance in respect of the presentation of debt issue costs.