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Consolidated Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Cash flows from operating activities:      
Net income $ 102,812 $ 55,420 $ 22,880
Adjustments to reconcile net income to net cash provided by operating activities:      
Loss on disposal of property, plant and equipment 662 233 136
Depreciation expense 38,975 35,210 34,030
Amortization of intangibles 7,539 7,613 4,652
Amortization of government grants (349) (154) (115)
Stock compensation expense 14,220 11,521 9,355
Deferred taxes (10,583) (10,430) (6,121)
Changes in assets and liabilities:      
Increase in accounts receivable (37,538) (79,155) (32,081)
(Increase)/decrease in unbilled revenue (4,015) 13,227 (27,164)
(Increase)/decrease in other receivables (1,638) 1,125 (1,669)
(Increase)/decrease in prepayments and other current assets (898) 682 (1,345)
Increase in other non current assets (1,146) (861) (233)
Increase in payments on account 76,066 68,654 9,494
Increase in other current liabilities 43,291 17,035 20,390
Increase/(decrease) in other non current liabilities 899 189 (613)
Decrease in income taxes payable (5,013) (7,916) (2,753)
(Decrease)/increase in accounts payable (2,057) 1,038 (8,652)
Net cash provided by operating activities 221,227 113,431 20,191
Cash flows from investing activities:      
Purchase of property, plant and equipment (29,488) (30,791) (35,284)
Purchase of subsidiary undertakings and acquisition costs (93,553) (72,508) (69,836)
Cash acquired with subsidiary undertaking 1,039 2,572 8,300
Sale of short term investments 109,795 82,193 438
Purchase of short term investments (172,168) (102,575) (56,000)
Net cash used in investing activities (184,375) (121,109) (152,382)
Cash flows from financing activities:      
Drawdown of credit lines and facilities   20,000  
Repayment of credit lines and facilities   (20,000)  
Proceeds from the exercise of share options 26,993 13,015 4,665
Share issuance costs (70) (74) (76)
Excess tax benefit on exercise of equity compensation 1,651 1,274 681
Repurchase of ordinary shares   (15,605) (9,005)
Share repurchase costs   (190) (113)
Receipt of government grant 225 340  
Net cash provided by/(used in) financing activities 28,799 (1,240) (3,848)
Effect of exchange rate movements on cash 2,821 3,728 (430)
Net increase/(decrease) in cash and cash equivalents 68,472 (5,190) (136,469)
Cash and cash equivalents at beginning of year 114,047 119,237 255,706
Cash and cash equivalents at end of year $ 182,519 $ 114,047 $ 119,237