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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
Redeemable Noncontrolling Interest
Beginning balance (in shares) at Dec. 31, 2018   53,971,706          
Beginning balance at Dec. 31, 2018 $ 1,354,281 $ 4,658 $ 529,642 $ 983 $ (69,328) $ 888,326  
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net income 373,986         373,986  
Currency translation adjustment (1,313)       (1,313)    
Currency impact of long-term funding (2,710)       2,710    
Unrealized capital (loss)/gain - investments 681       681    
Actuarial gain (loss) on defined benefit pension plan (2,226)       (2,226)    
Amortization of interest rate hedge (923)       (923)    
Loss on interest rate hedge 0            
Total comprehensive income attributable to the Group 367,495            
Exercise of share options (in shares)   329,870          
Exercise of share options 21,621 $ 22 21,599        
Issue of restricted share units / performance share units (in shares)   355,730          
Issue of restricted share units / performance share units 24 $ 24          
Share based compensation expense 26,733   26,733        
Share issue costs (13)   (13)        
Repurchase of ordinary shares (in shares)   (1,035,100)          
Repurchase of ordinary shares (146,931) $ (69)   69   (146,931)  
Share repurchase costs (107)         (107)  
Exercise of call option on noncontrolling interest shares (5,048)         (5,048)  
Ending balance (in shares) at Dec. 31, 2019   53,622,206          
Ending balance at Dec. 31, 2019 1,618,055 $ 4,635 577,961 1,052 (75,819) 1,110,226  
Beginning balance at Dec. 31, 2018             $ 0
Increase (Decrease) in Temporary Equity [Roll Forward]              
Net income             1,870
Noncontrolling interest adjustment to redemption amount             32,592
Exercise of call option on noncontrolling interest shares             5,048
Ending balance at Dec. 31, 2019             39,510
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net income 332,331         332,331  
Currency translation adjustment 48,129       48,129    
Currency impact of long-term funding (1,603)       (1,603)    
Unrealized capital (loss)/gain - investments (231)       (231)    
Actuarial gain (loss) on defined benefit pension plan (4,138)       (4,138)    
Amortization of interest rate hedge (910)       (910)    
Loss on interest rate hedge (905)       (905)    
Total comprehensive income attributable to the Group 372,673            
Exercise of share options (in shares)   193,417          
Exercise of share options 13,189 $ 13 13,176        
Issue of restricted share units / performance share units (in shares)   207,688          
Issue of restricted share units / performance share units 14 $ 14          
Share based compensation expense 25,981   25,981        
Share issue costs (14)   (14)        
Repurchase of ordinary shares (in shares)   (1,235,218)          
Repurchase of ordinary shares (175,000) $ (82)   82   (175,000)  
Share repurchase costs $ (140)         (140)  
Ending balance (in shares) at Dec. 31, 2020 52,788,093 52,788,093          
Ending balance at Dec. 31, 2020 $ 1,850,236 $ 4,580 617,104 1,134 (35,477) 1,262,895  
Increase (Decrease) in Temporary Equity [Roll Forward]              
Net income             633
Noncontrolling interest adjustment to redemption amount (4,522)         (4,522) 4,522
Exercise of call option on noncontrolling interest shares             (44,665)
Ending balance at Dec. 31, 2020             $ 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net income 153,185         153,185  
Currency translation adjustment (60,092)       (60,092)    
Currency impact of long-term funding (525)       (525)    
Unrealized capital (loss)/gain - investments 0            
Actuarial gain (loss) on defined benefit pension plan 4,266       4,266    
Amortization of interest rate hedge 113       113    
Loss on interest rate hedge 778       778    
Total comprehensive income attributable to the Group 97,725            
Exercise of share options (in shares)   1,065,529          
Exercise of share options 118,589 $ 77 118,512        
Issue of restricted share units / performance share units (in shares)   328,634          
Issue of restricted share units / performance share units 23 $ 23          
Share based compensation expense 133,553   133,553        
Share issue costs (853)   (853)        
Issue of shares associated with a business combination (in shares)   27,372,427          
Issue of shares associated with a business combination 5,658,155 $ 1,960 5,656,195        
Replacement share-based awards issued to acquiree employees $ 209,399   209,399        
Ending balance (in shares) at Dec. 31, 2021 81,554,683 81,554,683          
Ending balance at Dec. 31, 2021 $ 8,066,827 $ 6,640 $ 6,733,910 $ 1,134 $ (90,937) $ 1,416,080