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Cash and cash equivalents (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Cash And Cash Equivalents [Line Items]
Cash on hand	$ 71	$ 75
Cash in banks	105,141	101,662
Other demand deposits	6,986	746
Total cash	112,198	102,483
Short-term deposits, classified as cash equivalents	149,099	187,666
Short-term investments, classified as cash equivalents	327,233	265,917
Total cash equivalents	476,332	453,583
Total cash and cash equivalents	$ 588,530	$ 556,066	$ 630,438	$ 514,669

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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- 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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The amount of cash and cash equivalents that the entity does not separately disclose in the same statement or note. [Refer: Cash and cash equivalents]

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