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Cash and cash equivalents (Details 1) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Cash and Cash Equivalents [Line Items] |  |
Short-term investments, classified as cash equivalents | $ 265,917 | $ 287,797
Legg Mason - Western Asset Institutional Cash Reserves [Member] |  |
Cash and Cash Equivalents [Line Items] |  |
Short-term investments, classified as cash equivalents | 132,108 | 144,464
JP Morgan US dollar Liquidity Fund Institutional [Member] |  |
Cash and Cash Equivalents [Line Items] |  |
Short-term investments, classified as cash equivalents | $ 133,809 | $ 143,333

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- Definition A classification of cash equivalents representing short-term investments. [Refer: Cash equivalents] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 7 -IssueDate 2018-01-01 -Paragraph 45 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=7&date=2018-03-01&anchor=para_45&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Details
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- Details
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