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Debt instruments (Tables)

12 Months Ended

Dec. 31, 2018

Disclosure of detailed information about borrowings [abstract]

Schedule of debt instruments

Debt instruments comprise the following at December 31:

		2018	2017
		US$'000	US$'000
Unsecured notes carried at amortised cost
Principal amount		350,000	350,000
Unamortised issuance costs		(8,343)	(10,668)
Accrued coupon interest		10,937	10,938
Total		352,594	350,270
Amount due for settlement within 12 months		10,937	10,938
Amount due for settlement after 12 months		341,657	339,332
Total		352,594	350,270

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Schedule of detailed information about debt instruments.

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