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Cash and cash equivalents - Summary of Cash and Cash Equivalents (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Cash and cash equivalents [abstract]
Cash	$ 173,801	$ 200,644
Short-term bank deposits	3,941	85,668
Cash and cash equivalents	$ 177,742	$ 286,312	$ 479,501

X

- Definition

A classification of cash equivalents representing banking arrangements that the entity does not separately disclose in the same statement or note. [Refer: Cash equivalents]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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X

- Definition

The amount of cash on hand and demand deposits. [Refer: Cash on hand]

+ References

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- Definition

The amount of cash on hand and demand deposits, along with short-term, highly liquid investments that are readily convertible to known amounts of cash and that are subject to an insignificant risk of changes in value. [Refer: Cash; Cash equivalents]

+ References

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No definition available.

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