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Cash and cash equivalents (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Cash and Cash Equivalents [Line Items]
Cash on hand	$ 75	$ 60
Cash in banks	101,662	50,137
Other demand deposits	746	1,530
Total cash	102,483	51,727
Short-term deposits, classified as cash equivalents	187,666	290,914
Short-term investments, classified as cash equivalents	265,917	287,797
Total cash equivalents	453,583	578,711
Total cash and cash equivalents	$ 556,066	$ 630,438	$ 514,669	$ 527,259

X

- Definition

The amount of cash balances held at banks.

+ References

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

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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]

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