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Acquisitions (Details) $ in Thousands, € in Millions, £ in Millions | Mar. 01, 2017 USD ($) | Mar. 01, 2017 GBP (£) | Feb. 28, 2017 USD ($) | Jan. 13, 2017 USD ($) | Jan. 13, 2017 GBP (£) | Jan. 03, 2017 USD ($) | Jan. 03, 2017 EUR (€) | Nov. 30, 2016 USD ($) | Nov. 30, 2016 GBP (£) | Feb. 01, 2016 USD ($)
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GJ Creative Limited |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Acquisition price | $ 37,596 | £ 30.5 |  |  |  |  |  |  |  |
RAF Technology, Inc. |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Acquisition price |  |  | $ 8,746 |  |  |  |  |  |  |
VCG (Holdings) Limited |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Acquisition price |  |  |  | $ 10,695 | £ 8.8 |  |  |  |  |
Ungricht |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Acquisition price |  |  |  |  |  | $ 23,736 | € 22.7 |  |  |
Guidance Automation Limited |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Acquisition price |  |  |  |  |  |  |  | $ 9,974 | £ 8.0 |
DDI |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Acquisition price |  |  |  |  |  |  |  |  |  | $ 8,773

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