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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 |

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- Definition The portion of profit or loss for the period, net of income taxes, which is attributable to the parent. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(22)) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(18)) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(20)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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- Definition The cash outflow to reacquire common stock during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3291-108585 + Details
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- Definition The cash outflow for loan and debt issuance costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3291-108585 + Details
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- Definition The cash outflow for cost incurred directly with the issuance of an equity security. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3291-108585 + Details
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- Definition The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3213-108585 + Details
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- Definition The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3213-108585 + Details
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- Definition The cash outflow for securities or other assets acquired, which qualify for treatment as an investing activity and are to be liquidated, if necessary, within the current operating cycle. Includes cash flows from securities classified as trading securities that were acquired for reasons other than sale in the short-term. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3213-108585 + Details
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- Definition The cash inflow from sales of all investments, including securities and other assets, having ready marketability and intended by management to be liquidated, if necessary, within the current operating cycle. Includes cash flows from securities classified as trading securities that were acquired for reasons other than sale in the short-term. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3179-108585 + Details
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- Definition Amount of cash inflow from exercise of stock options granted under share-based compensation arrangement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3255-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=96867065&loc=SL79508275-113901 + Details
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