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Condensed Consolidated Balance Sheets - USD ($)
$ in Thousands
Jun. 30, 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:        
Ordinary shares 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