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Fair value measurement - Assets and Liabilities (Details) - Recurring - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
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Assets, Fair Value Disclosure [Abstract] |  |
Cash and cash equivalents | $ 132,496 | $ 221,626
Total assets | 132,496 | 221,626
Liabilities, Fair Value Disclosure [Abstract] |  |
Contingent consideration | 1,838 | 2,926
Total liabilities | 1,900 | 3,763
Related party |  |
Liabilities, Fair Value Disclosure [Abstract] |  |
Derivative financial instruments | 51 | 578
Long-term Debt [Member] |  |
Liabilities, Fair Value Disclosure [Abstract] |  |
Derivative financial instruments | 11 | 259
Fair value hierarchy Level 1 |  |
Assets, Fair Value Disclosure [Abstract] |  |
Cash and cash equivalents | 132,496 | 221,626
Total assets | 132,496 | 221,626
Fair value hierarchy Level 3 |  |
Liabilities, Fair Value Disclosure [Abstract] |  |
Contingent consideration | 1,838 | 2,926
Total liabilities | 1,900 | 3,763
Fair value hierarchy Level 3 | Related party |  |
Liabilities, Fair Value Disclosure [Abstract] |  |
Derivative financial instruments | 51 | 578
Fair value hierarchy Level 3 | Long-term Debt [Member] |  |
Liabilities, Fair Value Disclosure [Abstract] |  |
Derivative financial instruments | $ 11 | $ 259

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- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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- Definition Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash -URI http://asc.fasb.org/extlink&oid=6506951 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 + Details
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- Definition Fair value of the assets less the liabilities of a derivative or group of derivatives. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13433-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13495-108611 + Details
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