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Fair value measurement - Assets and liabilities measured on a recurring basis (Details) - Recurring - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018
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Assets, Fair Value Disclosure [Abstract] |  |
Cash and cash equivalents | $ 187,035 | $ 237,342
Total assets | 187,035 | 237,342
Liabilities, Fair Value Disclosure [Abstract] |  |
Total liabilities | 3,251 | 1,375
Related party |  |
Liabilities, Fair Value Disclosure [Abstract] |  |
Derivative financial instruments | 3,251 | 803
Debt |  |
Liabilities, Fair Value Disclosure [Abstract] |  |
Derivative financial instruments |  | 572
Fair value hierarchy Level 1 |  |
Assets, Fair Value Disclosure [Abstract] |  |
Cash and cash equivalents | 187,035 | 237,342
Total assets | 187,035 | 237,342
Level 3 |  |
Liabilities, Fair Value Disclosure [Abstract] |  |
Total liabilities | 3,251 | 1,375
Level 3 | Related party |  |
Liabilities, Fair Value Disclosure [Abstract] |  |
Derivative financial instruments | $ 3,251 | 803
Level 3 | Debt |  |
Liabilities, Fair Value Disclosure [Abstract] |  |
Derivative financial instruments |  | $ 572

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=117815213&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 No definition available. + 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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=118260190&loc=d3e13433-108611 + Details
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- Definition Fair value of financial and nonfinancial obligations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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