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Condensed Consolidated Statements of Shareholders' Equity and Comprehensive Income - USD ($)
$ in Thousands
Total
Ordinary Shares
Additional Paid-in Capital
Other Undenominated Capital
Accumulated Other Comprehensive Income (Loss)
Retained Earnings
Cumulative effect adjustment from adoption of ASC 606 | Accounting Standards Update 2014-09 $ (48,104)         $ (48,104)
Balance (in shares) at Dec. 31, 2017 54,081,601 54,081,601        
Balance (in shares) (Accounting Standards Update 2014-09) at Dec. 31, 2017   54,081,601        
Beginning balance at Dec. 31, 2017 $ 1,191,000 $ 4,664 $ 481,337 $ 912 $ (38,713) 742,800
Beginning balance (Accounting Standards Update 2014-09) at Dec. 31, 2017 1,142,896 $ 4,664 481,337 912 (38,713) 694,696
Net income 149,966         149,966
Currency translation adjustment (20,813)       (20,813)
Currency impact of long term funding (net of tax) (3,055)       (3,055)  
Unrealized capital gain – investments (423)       (423)  
Amortization of interest rate hedge (463)       (463)  
Fair value of cash flow hedge (net of tax) (2,055)       $ (2,055)  
Total comprehensive income 123,157         149,966
Exercise of share options (in shares)   226,888        
Exercise of share options 10,301 $ 17 10,284      
Issue of restricted share units (in shares)   483,435        
Issue of restricted share units 36 $ 36        
Non-cash stock compensation expense 16,583   16,583      
Share issuance costs (9)   $ (9)      
Share repurchase program (in shares)   (464,055)        
Share repurchase program (54,172) $ (33)   $ 33   (54,172)
Share repurchase costs $ (44)         (44)
Balance (in shares) at Jun. 30, 2018 54,327,869          
Ending balance at Jun. 30, 2018 $ 1,238,748         $ 790,446