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Fair value measurement (Tables)

12 Months Ended

Dec. 31, 2018

Disclosure of financial liabilities [abstract]

Schedule of assets and liabilities measured at fair value


		December 31, 2018
				Quoted prices in active markets		Significant observable inputs		Significant unobservable inputs
		Total		(Level 1)		(Level 2)		(Level 3)
		US$'000		US$'000		US$'000		US$'000
Other assets (Note 12):
Biological assets		7,790		—		—		7,790
Other financial assets (Note 10):
Debt investments		67,079		—		—		67,079
Listed equity securities		2,523		2,523		—		—
Other financial liabilities (Note 19):
Derivative financial instruments - cross currency swap		(20,384)		—		(20,384)		—
Derivative financial instruments - interest rate swaps		(3,079)		—		(3,079)		—
Other liabilities (Note 21)
Contingent consideration in a business combinations		(26,222)		—		—		(26,222)


		December 31, 2017
				Quoted prices in active markets		Significant observable inputs		Significant unobservable inputs
		Total		(Level 1)		(Level 2)		(Level 3)
		US$'000		US$'000		US$'000		US$'000
Other assets (Note 12):
Biological assets		27,279		—		—		27,279
Other financial assets (Note 10):
Other		82,638		—		—		82,638
Other financial liabilities (Note 19):
Derivative financial instruments - cross currency swap		(33,648)		—		(33,648)		—
Derivative financial instruments - interest rate swaps		(4,392)		—		(4,392)		—

Schedule of changes fair value of biological assets classified at level 3 in the hierarchy


		Level 3
		US$'000
January 1, 2017		17,365
Gain recognised in profit or loss (Note 25.5)		7,504
Translation differences		2,410
December 31, 2017		27,279
Loss recognised in profit or loss (Note 25.5)		(7,615)
Disposal of biological assets		(12,168)
Translation differences		294
December 31, 2018		7,790