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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
Retained Earnings
Beginning balance (in shares) at Dec. 31, 2015   54,958,912        
Beginning balance at Dec. 31, 2015 $ 763,096 $ 4,719 $ 383,355 $ 715 $ (61,636) $ 435,943
Comprehensive Income:            
Net income 262,179         262,179
Currency translation adjustment (12,839)       (12,839)  
Currency impact of long-term funding (8,428)       (8,428)  
Unrealized capital loss - investments 11       11  
Actuarial gain/(loss) on defined benefit pension plan (2,485)       (2,485)  
Amortization of interest rate hedge (923)       (923)  
Fair value of cash flow hedge 0          
Total comprehensive income 237,515          
Exercise of share options (in shares)   393,240        
Exercise of share options 10,139 $ 26 10,113      
Issue of restricted share units / performance share units (in shares)   607,878        
Issue of restricted share units / performance share units 41 $ 41        
Share based compensation expense 40,343   40,343      
Share issue costs (17)   (17)      
Repurchase of ordinary shares (in shares)   (1,429,187)        
Repurchase of ordinary shares (110,000) $ (94)   94   (110,000)
Share repurchase costs (275)         (275)
Excess income tax benefit on exercise of equity compensation 4,332   4,332      
Ending balance (in shares) at Dec. 31, 2016   54,530,843        
Ending balance at Dec. 31, 2016 945,174 $ 4,692 438,126 809 (86,300) 587,847
Comprehensive Income:            
Net income 281,488         281,488
Currency translation adjustment 33,966       33,966  
Currency impact of long-term funding 13,730       13,730  
Unrealized capital loss - investments (272)       (272)  
Actuarial gain/(loss) on defined benefit pension plan 50       50  
Amortization of interest rate hedge (923)       (923)  
Fair value of cash flow hedge 1,036       1,036  
Total comprehensive income 329,075          
Exercise of share options (in shares)   458,243        
Exercise of share options 13,906 $ 31 13,875      
Issue of restricted share units / performance share units (in shares)   681,742        
Issue of restricted share units / performance share units 44 $ 44        
Share based compensation expense 29,351   29,351      
Share issue costs (15)   (15)      
Repurchase of ordinary shares (in shares)   (1,589,227)        
Repurchase of ordinary shares (133,106) $ (103)   103   (133,106)
Share repurchase costs $ (106)         (106)
Ending balance (in shares) at Dec. 31, 2017 54,081,601 54,081,601        
Ending balance at Dec. 31, 2017 $ 1,191,000 $ 4,664 481,337 912 (38,713) 742,800
Comprehensive Income:            
Cumulative effect adjustment from adoption of new accounting principal | Accounting Standards Update 2016-09 6,677         6,677
Net income 322,656         322,656
Currency translation adjustment (26,522)       (26,522)  
Currency impact of long-term funding (4,834)       (4,834)  
Unrealized capital loss - investments (155)       (155)  
Actuarial gain/(loss) on defined benefit pension plan 2,855       2,855  
Amortization of interest rate hedge (923)       (923)  
Fair value of cash flow hedge (1,036)       (1,036)  
Total comprehensive income 292,041          
Exercise of share options (in shares)   408,699        
Exercise of share options 16,806 $ 29 16,777      
Issue of restricted share units / performance share units (in shares)   489,568        
Issue of restricted share units / performance share units 36 $ 36        
Share based compensation expense 31,544   31,544      
Share issue costs (16)   (16)      
Repurchase of ordinary shares (in shares)   (1,008,162)        
Repurchase of ordinary shares (128,960) $ (71)   71   (128,960)
Share repurchase costs $ (66)         (66)
Ending balance (in shares) at Dec. 31, 2018 53,971,706 53,971,706        
Ending balance at Dec. 31, 2018 $ 1,354,281 $ 4,658 $ 529,642 $ 983 $ (69,328) $ 888,326