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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Cash flows from operating activities:    
Net income $ 187,917 $ 175,997
Adjustments to reconcile net income to net cash provided by operating activities:    
Loss on disposal of property, plant and equipment 27 7
Depreciation expense 31,374 30,037
Amortization of intangibles 12,746 12,498
Amortization of grants (33) (29)
Accrued interest on short term investments (498)  
Realised gain on sale of short term investments (39)  
Share compensation expense 31,135 24,043
Amortization of gain on interest rate hedge (693)  
Amortization of financing costs 422  
Deferred taxes 3,262 (749)
Changes in assets and liabilities:    
Decrease/(increase) in accounts receivable 17,825 (7,817)
Increase in unbilled revenue (18,373) (50,707)
Increase in other receivables (11,876) (10,701)
Increase in prepayments and other current assets (1,395) (11,718)
(Increase)/decrease in other non-current assets (1,857) 272
(Decrease)/increase in payments on account (67,868) 10,615
Decrease in other current liabilities (48,200) (20,363)
Increase in other non-current liabilities 4,118 1,843
Increase in income taxes payable 4,163 9,097
(Decrease)/increase in accounts payable (2,826) 1,102
Change in deferred tax liability (3,666)  
Net cash provided by operating activities 135,665 163,427
Cash flows from investing activities:    
Purchase of property, plant and equipment (29,345) (36,255)
Purchase of subsidiary undertakings (54,009) (102,756)
Cash acquired with subsidiary undertaking 1,842  
Purchase of short term investments (19,047) (9,652)
Sale of short term investments 21,484 25,170
Net cash used in investing activities (79,075) (123,493)
Cash flows from financing activities:    
Proceeds from exercise of share options & restricted share units 7,243 18,375
Share issuance costs (16) (6)
Tax benefit from the exercise of share options 5,381 3,014
Repurchase of ordinary shares   (286,923)
Share repurchase costs   (802)
Drawdown of bank credit lines and loan facilities 73,000 350,000
Repayment of bank credit lines and loan facilities (20,000)  
Financing costs (6,626)  
Net cash provided by financing activities 58,982 83,658
Effect of exchange rate movements on cash (175) (7,244)
Net increase in cash and cash equivalents 115,397 116,348
Cash and cash equivalents at beginning of period 103,911 [1] 118,900
Cash and cash equivalents at end of period $ 219,308 $ 235,248
[1] The December 31, 2015 Balance Sheet has been retrospectively restated as required to reflect the requirements of new guidance in respect of the presentation of debt issue costs.