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Impact of change in accounting policies Statement of cash flows (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Cash flows from operating activities [Abstract]        
Net income $ 71,868 $ 64,817 $ 149,966 $ 136,226
Adjustments to reconcile net income to net cash provided by operating activities:        
Loss on disposal of property, plant and equipment     2 348
Depreciation expense     23,779 20,387
Amortization of intangibles     10,165 8,456
Amortization of government grants     (24) (21)
Interest on short term investments     (712) (536)
Stock compensation expense 7,038 9,892 16,430 18,701
Amortization of gain on interest rate hedge     (463) (462)
Amortization of financing costs     530 282
Deferred taxes     (2,745) (581)
Changes in assets and liabilities:        
Increase in accounts receivable     (26,685) 59,812
Increase (Decrease) in Contract with Customer, Asset     51,052 55,081
(Increase)/decrease in other receivables     (5,082) (6,234)
Decrease in prepayments and other current assets     9,777 (3,677)
Increase in other non-current assets     (338) (737)
Increase/(decrease) in payments on account     2,616 (11,463)
Decrease in other current liabilities     (38,547) 4,558
Decrease in other non-current liabilities     (1,083) (4,442)
Decrease in income taxes payable     (3,622) 3,802
Decrease in accounts payable     (3,241) (920)
Net cash provided by operating activities     79,671 168,418
Cash flows from investing activities [Abstract]        
Purchase of property, plant and equipment     (17,219) (15,179)
Purchase of subsidiary undertakings     (1,645) 0
Purchase of short term investments     (55,608) (24,919)
Sale of short term investments     49,708 6,950
Net cash used in investing activities     (24,764) (33,148)
Cash flows from financing activities [Abstract]        
Financing costs     (823)  
Proceeds from exercise of equity compensation     10,334 5,914
Share issue costs     (9) (10)
Repurchase of ordinary shares     (54,172) (108,106)
Share repurchase costs     (44) (86)
Net cash used in financing activities     (44,714) (102,288)
Effect of exchange rate movements on cash     (3,833) 2,731
Net increase in cash and cash equivalents     6,360 35,713
Cash and cash equivalents at beginning of period     282,859 192,541
Cash and cash equivalents at end of period 289,219 $ 228,254 289,219 $ 228,254
Difference between Revenue Guidance in Effect before and after Topic 606        
Cash flows from operating activities [Abstract]        
Net income     2,334  
Cash flows from financing activities [Abstract]        
Financing costs     0  
Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09        
Cash flows from operating activities [Abstract]        
Net income 1,397   2,334  
Adjustments to reconcile net income to net cash provided by operating activities:        
Loss on disposal of property, plant and equipment     0  
Depreciation expense     0  
Amortization of intangibles     0  
Amortization of government grants     0  
Interest on short term investments     0  
Stock compensation expense     0  
Amortization of gain on interest rate hedge     0  
Amortization of financing costs     0  
Deferred taxes     6,276  
Changes in assets and liabilities:        
Increase in accounts receivable     0  
Increase in unbilled revenue     3,275  
(Increase)/decrease in other receivables     12,330  
Decrease in prepayments and other current assets     0  
Increase in other non-current assets     0  
Increase/(decrease) in payments on account     (25,100)  
Decrease in other current liabilities     0  
Decrease in other non-current liabilities     0  
Decrease in income taxes payable     885  
Decrease in accounts payable     0  
Net cash provided by operating activities     0  
Cash flows from investing activities [Abstract]        
Purchase of property, plant and equipment     0  
Purchase of subsidiary undertakings     0  
Purchase of short term investments     0  
Sale of short term investments     0  
Net cash used in investing activities     0  
Cash flows from financing activities [Abstract]        
Proceeds from exercise of equity compensation     0  
Share issue costs     0  
Repurchase of ordinary shares     0  
Share repurchase costs     0  
Net cash used in financing activities     0  
Effect of exchange rate movements on cash      
Net increase in cash and cash equivalents     0  
Cash and cash equivalents at beginning of period      
Cash and cash equivalents at end of period 0   0  
Calculated under Revenue Guidance in Effect before Topic 606        
Cash flows from financing activities [Abstract]        
Financing costs     (823)  
Calculated under Revenue Guidance in Effect before Topic 606 | Accounting Standards Update 2014-09        
Cash flows from operating activities [Abstract]        
Net income 73,265   152,300  
Adjustments to reconcile net income to net cash provided by operating activities:        
Loss on disposal of property, plant and equipment     2  
Depreciation expense     23,779  
Amortization of intangibles     10,165  
Amortization of government grants     (24)  
Interest on short term investments     (712)  
Stock compensation expense     16,430  
Amortization of gain on interest rate hedge     (463)  
Amortization of financing costs     530  
Deferred taxes     3,531  
Changes in assets and liabilities:        
Increase in accounts receivable     (26,685)  
Increase in unbilled revenue     (47,777)  
(Increase)/decrease in other receivables     7,248  
Decrease in prepayments and other current assets     9,777  
Increase in other non-current assets     (338)  
Increase/(decrease) in payments on account     (22,484)  
Decrease in other current liabilities     (38,547)  
Decrease in other non-current liabilities     (1,083)  
Decrease in income taxes payable     (2,737)  
Decrease in accounts payable     (3,241)  
Net cash provided by operating activities     79,671  
Cash flows from investing activities [Abstract]        
Purchase of property, plant and equipment     (17,219)  
Purchase of subsidiary undertakings     (1,645)  
Purchase of short term investments     (55,608)  
Sale of short term investments     49,708  
Net cash used in investing activities     (24,764)  
Cash flows from financing activities [Abstract]        
Proceeds from exercise of equity compensation     10,334  
Share issue costs     (9)  
Repurchase of ordinary shares     (54,172)  
Share repurchase costs     (44)  
Net cash used in financing activities     (44,714)  
Effect of exchange rate movements on cash     (3,833)  
Net increase in cash and cash equivalents     6,360  
Cash and cash equivalents at beginning of period     282,859  
Cash and cash equivalents at end of period $ 289,219   $ 289,219