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Cash and cash equivalents (Details 1) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
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

X

- 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

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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.

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