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Intangible assets - Rollfoward (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Reconciliation of changes in intangible assets other than goodwill [abstract]
Intangible assets other than goodwill	$ 17,950	$ 18,083
Additions to and acquisition of intangible assets		3,376
Amortization expense	(2,354)	(2,309)
Disposals	(7,311)
Impairment charges (note 28)		(1,200)
Intangible assets other than goodwill	8,285	17,950
Cost
Reconciliation of changes in intangible assets other than goodwill [abstract]
Intangible assets other than goodwill	69,547	66,171
Additions to and acquisition of intangible assets		3,376
Amortization expense	0	0
Disposals	(9,138)
Impairment charges (note 28)		0
Intangible assets other than goodwill	60,409	69,547
Accumulated amortisation
Reconciliation of changes in intangible assets other than goodwill [abstract]
Intangible assets other than goodwill	(51,597)	(48,088)
Additions to and acquisition of intangible assets		0
Amortization expense	(2,354)	(2,309)
Disposals	1,827
Impairment charges (note 28)		(1,200)
Intangible assets other than goodwill	$ (52,124)	$ (51,597)

X

- Definition

Additions To And Acquisitions Through Business Combinations, Intangible Assets Other Than Goodwill

+ References

No definition available.

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- Definition

The amount of amortisation of intangible assets other than goodwill. [Refer: Depreciation and amortisation expense; Intangible assets other than goodwill]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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The decrease in intangible assets other than goodwill resulting from disposals. [Refer: Intangible assets other than goodwill]

+ References

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- Definition

The amount of impairment loss recognised in profit or loss for intangible assets other than goodwill. [Refer: Impairment loss recognised in profit or loss; Intangible assets other than goodwill]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition

The amount of identifiable non-monetary assets without physical substance. This amount does not include goodwill. [Refer: Goodwill]

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