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Assets held for sale (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Disclosure of fair value measurement of assets [line items]
Impairment loss recognised in profit or loss, property, plant and equipment	$ 202	$ 1,143
Assets held for sale	1,701
San Jose M&I Property [member]
Disclosure of fair value measurement of assets [line items]
Assets held for sale	1,701
San Jose M&I Property [member] | Non-current assets held for sale [member]
Disclosure of fair value measurement of assets [line items]
Impairment loss recognised in profit or loss, property, plant and equipment	$ 901

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- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

+ References

No definition available.

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- Definition

The amount of impairment loss recognised in profit or loss for property, plant and equipment. [Refer: Impairment loss recognised in profit or loss; Property, plant and equipment]

+ References

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

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

+ References

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