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Financial - risk management objectives and policies (Details 2) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Disclosure of financial risk management objectives and policies [line items]
Financial liabilities	$ 633,083	$ 592,342	$ 353,710	$ 383,305
Not later than one year [member]
Disclosure of financial risk management objectives and policies [line items]
Financial liabilities	454,726	383,869
Later than one year and not later than two years [member]
Disclosure of financial risk management objectives and policies [line items]
Financial liabilities	149,381	116,375
Later than five years [member]
Disclosure of financial risk management objectives and policies [line items]
Financial liabilities	28,469	48,822
Later ThanTwo Year And Not LaterThan Five Year Member [Member]
Disclosure of financial risk management objectives and policies [line items]
Financial liabilities	458,969	509,632
Bank loans [member]
Disclosure of financial risk management objectives and policies [line items]
Financial liabilities	96,580	55,000
Bank loans [member] | Not later than one year [member]
Disclosure of financial risk management objectives and policies [line items]
Financial liabilities	96,580	55,000
Bank loans [member] | Later than one year and not later than two years [member]
Disclosure of financial risk management objectives and policies [line items]
Financial liabilities	0	0
Bank loans [member] | Later than five years [member]
Disclosure of financial risk management objectives and policies [line items]
Financial liabilities	0	0
Bank loans [member] | Later ThanTwo Year And Not LaterThan Five Year Member [Member]
Disclosure of financial risk management objectives and policies [line items]
Financial liabilities	0	0
Trade and other payables [member]
Disclosure of financial risk management objectives and policies [line items]
Financial liabilities	220,042	269,044
Trade and other payables [member] | Not later than one year [member]
Disclosure of financial risk management objectives and policies [line items]
Financial liabilities	219,379	253,062
Trade and other payables [member] | Later than one year and not later than two years [member]
Disclosure of financial risk management objectives and policies [line items]
Financial liabilities	663	0
Trade and other payables [member] | Later than five years [member]
Disclosure of financial risk management objectives and policies [line items]
Financial liabilities	0	15,982
Trade and other payables [member] | Later ThanTwo Year And Not LaterThan Five Year Member [Member]
Disclosure of financial risk management objectives and policies [line items]
Financial liabilities	0	0
Derivative financial instruments [member]
Disclosure of financial risk management objectives and policies [line items]
Financial liabilities	28,705	3,863
Derivative financial instruments [member] | Not later than one year [member]
Disclosure of financial risk management objectives and policies [line items]
Financial liabilities	28,705	3,863
Derivative financial instruments [member] | Later than one year and not later than two years [member]
Disclosure of financial risk management objectives and policies [line items]
Financial liabilities	0	0
Derivative financial instruments [member] | Later than five years [member]
Disclosure of financial risk management objectives and policies [line items]
Financial liabilities	0	0
Derivative financial instruments [member] | Later ThanTwo Year And Not LaterThan Five Year Member [Member]
Disclosure of financial risk management objectives and policies [line items]
Financial liabilities	0	0
Embedded derivative for sale of concentrates [member]
Disclosure of financial risk management objectives and policies [line items]
Financial liabilities		1,524
Embedded derivative for sale of concentrates [member] | Not later than one year [member]
Disclosure of financial risk management objectives and policies [line items]
Financial liabilities		1,524
Embedded derivative for sale of concentrates [member] | Later than one year and not later than two years [member]
Disclosure of financial risk management objectives and policies [line items]
Financial liabilities		0
Embedded derivative for sale of concentrates [member] | Later than five years [member]
Disclosure of financial risk management objectives and policies [line items]
Financial liabilities		0
Embedded derivative for sale of concentrates [member] | Later ThanTwo Year And Not LaterThan Five Year Member [Member]
Disclosure of financial risk management objectives and policies [line items]
Financial liabilities		0
Financial obligation [member]
Disclosure of financial risk management objectives and policies [line items]
Financial liabilities	708,469	686,519
Financial obligation [member] | Not later than one year [member]
Disclosure of financial risk management objectives and policies [line items]
Financial liabilities	110,062	70,420
Financial obligation [member] | Later than one year and not later than two years [member]
Disclosure of financial risk management objectives and policies [line items]
Financial liabilities	148,718	113,070
Financial obligation [member] | Later than five years [member]
Disclosure of financial risk management objectives and policies [line items]
Financial liabilities	0	0
Financial obligation [member] | Later ThanTwo Year And Not LaterThan Five Year Member [Member]
Disclosure of financial risk management objectives and policies [line items]
Financial liabilities	449,689	503,029
Contingent consideration liability [member]
Disclosure of financial risk management objectives and policies [line items]
Financial liabilities	37,749	42,748
Contingent consideration liability [member] | Not later than one year [member]
Disclosure of financial risk management objectives and policies [line items]
Financial liabilities	0	0
Contingent consideration liability [member] | Later than one year and not later than two years [member]
Disclosure of financial risk management objectives and policies [line items]
Financial liabilities	0	3,305
Contingent consideration liability [member] | Later than five years [member]
Disclosure of financial risk management objectives and policies [line items]
Financial liabilities	28,469	32,840
Contingent consideration liability [member] | Later ThanTwo Year And Not LaterThan Five Year Member [Member]
Disclosure of financial risk management objectives and policies [line items]
Financial liabilities	$ 9,280	$ 6,603

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- References

No definition available.

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- Definition

The amount of liabilities that are: (a) a contractual obligation: (i) to deliver cash or another financial asset to another entity; or (ii) to exchange financial assets or financial liabilities with another entity under conditions that are potentially unfavourable to the entity; or (b) a contract that will, or may be, settled in the entity’s own equity instruments and is: (i) a non-derivative for which the entity is, or may be, obliged to deliver a variable number of the entity’s own equity instruments; or (ii) a derivative that will, or may be, settled other than by the exchange of a fixed amount of cash or another financial asset for a fixed number of the entity’s own equity instruments. For this purpose, rights, options or warrants to acquire a fixed number of the entity’s own equity instruments for a fixed amount of any currency are equity instruments if the entity offers the rights, options or warrants pro rata to all of its existing owners of the same class of its own non-derivative equity instruments. Also, for those purposes the entity’s own equity instruments do not include puttable financial instruments that are classified as equity instruments in accordance with paragraphs 16A-16B of IAS 32, instruments that impose on the entity an obligation to deliver to another party a pro rata share of the net assets of the entity only on liquidation and are classified as equity instruments in accordance with paragraphs 16C-16D of IAS 32, or instruments that are contracts for the future receipt or delivery of the entity’s own equity instruments. As an exception, an instrument that meets the definition of a financial liability is classified as an equity instrument if it has all the features and meets the conditions in paragraphs 16A-16B or paragraphs 16C-16D of IAS 32. [Refer: Financial instruments, class [member]; Financial assets; Derivatives [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 7
-IssueDate 2017-01-01
-Paragraph 25
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-01&anchor=para_25&doctype=Standard
-URIDate 2017-03-09

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