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Impact of change in accounting policies Statement of shareholders' equity (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]          
Ordinary shares, shares issued (in shares) 54,327,869   54,327,869   54,081,601
Beginning balance     $ 1,191,000    
Net income $ 71,868 $ 64,817 149,966 $ 136,226  
Currency translation adjustment     (20,813)    
Currency impact of long term funding     (3,055)    
Tax on currency impact of long term funding     0    
Unrealized capital gain – investments     (423)    
Amortization of interest rate hedge     (463)    
Fair value of cash flow hedge     (2,055)    
Total comprehensive income     123,157    
Exercise of share options     10,301    
Issue of restricted share units     36    
Non-cash stock compensation expense     16,583    
Share issuance costs     (9)    
Share repurchase program     54,172    
Share repurchase costs     44    
Ending balance 1,238,748   1,238,748    
Common Stock [Member]          
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]          
Ordinary shares, shares issued (in shares)         54,081,601
Beginning balance     $ 4,664    
Exercise of share options (in shares)     226,888    
Exercise of share options     $ 17    
Issue of restricted share units (in shares)     483,435    
Issue of restricted share units     $ 36    
Share repurchase program (in shares)     (464,055)    
Share repurchase program     $ 33    
Additional Paid-in Capital          
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]          
Beginning balance     481,337    
Exercise of share options     10,284    
Non-cash stock compensation expense     16,583    
Share issuance costs     (9)    
Other Undenominated Capital          
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]          
Beginning balance     912    
Share repurchase program     (33)    
AOCI Attributable to Parent [Member]          
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]          
Beginning balance     (38,713)    
Currency translation adjustment     (20,813)    
Currency impact of long term funding     (3,055)    
Tax on currency impact of long term funding     0    
Unrealized capital gain – investments     (423)    
Amortization of interest rate hedge     (463)    
Fair value of cash flow hedge     (2,055)    
Retained Earnings [Member]          
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]          
Beginning balance     742,800    
Net income     149,966    
Currency translation adjustment        
Total comprehensive income     149,966    
Share repurchase program     54,172    
Share repurchase costs     44    
Ending balance 790,446   790,446    
Difference between Revenue Guidance in Effect before and after Topic 606          
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]          
Net income     2,334    
Difference between Revenue Guidance in Effect before and after Topic 606 | Retained Earnings [Member]          
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]          
Net income     2,334    
Calculated under Revenue Guidance in Effect before Topic 606          
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]          
Total comprehensive income     125,491    
Ending balance $ 1,289,186   $ 1,289,186    
Calculated under Revenue Guidance in Effect before Topic 606 | Common Stock [Member]          
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]          
Ordinary shares, shares issued (in shares) 54,327,869   54,327,869    
Ending balance $ 4,684   $ 4,684    
Calculated under Revenue Guidance in Effect before Topic 606 | Additional Paid-in Capital          
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]          
Ending balance 508,195   508,195    
Calculated under Revenue Guidance in Effect before Topic 606 | Other Undenominated Capital          
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]          
Ending balance 945   945    
Calculated under Revenue Guidance in Effect before Topic 606 | AOCI Attributable to Parent [Member]          
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]          
Total comprehensive income     (26,809)    
Ending balance (65,522)   (65,522)    
Calculated under Revenue Guidance in Effect before Topic 606 | Retained Earnings [Member]          
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]          
Total comprehensive income     152,300    
Ending balance $ 840,884   $ 840,884