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Income taxes (Schedule of Components of Deferred Tax Liabilities) (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Income Taxes [abstract]    
Property, plant and equipment $ 837 $ 900
Other 25
Total deferred tax liabilities 862 900
Alternative minimum tax credits 626 626
Other 28
Total deferred tax assets 626 654
Net deferred tax liabilities $ 236 $ 246