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Impact of change in accounting policies Balance sheet (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Jan. 01, 2018
Dec. 31, 2017
Jun. 30, 2017
Dec. 31, 2016
Current Assets:          
Cash and cash equivalents $ 289,219   $ 282,859 $ 228,254 $ 192,541
Short term investments - available for sale 83,777   77,589    
Accounts receivable, net 404,572   379,501    
Unbilled revenue 274,501   268,509    
Other receivables 48,068   33,798    
Prepayments and other current assets 24,038   34,377    
Income taxes receivable 24,475   24,385    
Total current assets 1,148,650   1,101,018    
Other Assets:          
Property, plant and equipment, net 155,020   163,051    
Goodwill 759,137   769,058   $ 616,088
Other non-current assets 15,715   15,393    
Non-current income taxes receivable 18,180   18,396    
Non-current deferred tax asset 17,420   8,074    
Intangible assets 60,374   71,628    
Total Assets 2,174,496   2,146,618    
Current Liabilities:          
Accounts payable 15,123   18,590    
Payments on account 326,741   298,992    
Other liabilities 192,339   233,503    
Income taxes payable 14,049   14,973    
Total current liabilities 548,252   566,058    
Other Liabilities:          
Non-current bank credit lines and loan facilities 349,074   348,888    
Non-current other liabilities 16,179   17,111    
Non-current government grants 908   966    
Non-current income taxes payable 13,622   14,879    
Non-current deferred tax liability 7,713   7,716    
Commitments and contingencies 0   0    
Total Liabilities 935,748   955,618    
Shareholders' Equity:          
Common Stock, Value, Issued 4,684   4,664    
Additional paid‑in capital 508,195   481,337    
Other undenominated capital 945   912    
Accumulated other comprehensive income (65,522)   (38,713)    
Retained earnings 790,446   742,800    
Total Shareholders' Equity 1,238,748   1,191,000    
Total Liabilities and Shareholders' Equity 2,174,496   2,146,618    
Accounting Standards Update 2014-09          
Shareholders' Equity:          
Total Shareholders' Equity     1,142,896    
Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09          
Current Assets:          
Cash and cash equivalents 0      
Short term investments - available for sale 0        
Accounts receivable, net 0        
Unbilled revenue 44,829 $ 42,000      
Other receivables (12,330)        
Prepayments and other current assets 0        
Income taxes receivable 0        
Total current assets 32,499        
Other Assets:          
Property, plant and equipment, net 0        
Goodwill 0        
Other non-current assets 0        
Non-current income taxes receivable 0        
Non-current deferred tax asset (6,276)        
Intangible assets 0        
Total Assets 26,223        
Current Liabilities:          
Accounts payable 0        
Payments on account (25,100)        
Other liabilities 0        
Income taxes payable 885        
Total current liabilities (24,215)        
Other Liabilities:          
Non-current bank credit lines and loan facilities 0        
Non-current other liabilities 0        
Non-current government grants 0        
Non-current income taxes payable 0        
Non-current deferred tax liability 0        
Commitments and contingencies 0        
Total Liabilities (24,215)        
Shareholders' Equity:          
Common Stock, Value, Issued 0        
Additional paid‑in capital 0        
Other undenominated capital 0        
Accumulated other comprehensive income 0        
Retained earnings 50,438        
Total Shareholders' Equity 50,438        
Total Liabilities and Shareholders' Equity 26,223        
Calculated under Revenue Guidance in Effect before Topic 606          
Shareholders' Equity:          
Total Shareholders' Equity 1,289,186        
Calculated under Revenue Guidance in Effect before Topic 606 | Accounting Standards Update 2014-09          
Current Assets:          
Cash and cash equivalents 289,219   $ 282,859    
Short term investments - available for sale 83,777        
Accounts receivable, net 404,572        
Unbilled revenue 319,330        
Other receivables 35,738        
Prepayments and other current assets 24,038        
Income taxes receivable 24,475        
Total current assets 1,181,149        
Other Assets:          
Property, plant and equipment, net 155,020        
Goodwill 759,137        
Other non-current assets 15,715        
Non-current income taxes receivable 18,180        
Non-current deferred tax asset 11,144        
Intangible assets 60,374        
Total Assets 2,200,719        
Current Liabilities:          
Accounts payable 15,123        
Payments on account 301,641        
Other liabilities 192,339        
Income taxes payable 14,934        
Total current liabilities 524,037        
Other Liabilities:          
Non-current bank credit lines and loan facilities 349,074        
Non-current other liabilities 16,179        
Non-current government grants 908        
Non-current income taxes payable 13,622        
Non-current deferred tax liability 7,713        
Commitments and contingencies 0        
Total Liabilities 911,533        
Shareholders' Equity:          
Common Stock, Value, Issued 4,684        
Additional paid‑in capital 508,195        
Other undenominated capital 945        
Accumulated other comprehensive income (65,522)        
Retained earnings 840,884        
Total Shareholders' Equity 1,289,186        
Total Liabilities and Shareholders' Equity $ 2,200,719