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Income taxes (Schedule of Components of Deferred Tax Liabilities) (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Income Taxes [abstract]
Property, plant and equipment	$ 900	$ 972
Deferred tax liabilities	900	972
Alternative minimum tax credits	626
Other	28	138
Total deferred tax assets	654	138
Net deferred tax liabilities	$ 246	$ 834

X

- Definition

The amounts of income taxes recoverable in future periods in respect of: (a) deductible temporary differences; (b) the carryforward of unused tax losses; and (c) the carryforward of unused tax credits. [Refer: Temporary differences [member]; Unused tax credits [member]; Unused tax losses [member]]

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The amounts of income taxes payable in future periods in respect of taxable temporary differences. [Refer: Temporary differences [member]]

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The amounts of income taxes payable in future periods in respect of taxable temporary differences from property, plant and equipment.

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