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Cash and cash equivalents (Details 4) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Cash And Cash Equivalent [Line Items]
Cash and cash equivalents	$ 556,066	$ 630,438	$ 514,669	$ 527,259
Other current financial assets	312,721	366,979
Other non-current financial assets	17,131	42,879
Borrowings - repayable within one year (including overdraft)	0	(163,568)
Borrowings - repayable after one year	(68,870)	0
Net Debt	(471,755)	(245,508)
Cash and liquid investments	882,212	1,006,327
Gross debt - fixed interest rates	(1,353,967)	(1,251,835)
Net Debt	$ (471,755)	$ (245,508)

X

- 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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- Definition

The non-current portion of non-current borrowings. [Refer: Borrowings]

+ References

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- Definition

The amount of net debt of the entity.

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The amount of current financial assets that the entity does not separately disclose in the same statement or note. [Refer: Other financial assets; Current financial assets]

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