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Provisions and other liabilities - Narrative (Details) - USD ($)
 1 Months Ended 12 Months Ended
Dec. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of other provisions [line items]        
Provisions made during the year   $ 5,920,000 $ 5,563,000  
Upward adjustments / increase in provision   171,000 0  
Expenditures   1,969,000 2,329,000  
Downward adjustments / provision eliminated   210,000 1,279,000  
Effect of movements in exchange rates   (336,000) 313,000  
Provisions $ 9,700,000 13,105,000 9,700,000 $ 7,432,000
Restructuring provision        
Disclosure of other provisions [line items]        
Provisions made during the year   509,000 912,000  
Expenditures   560,000 1,424,000  
Downward adjustments / provision eliminated   2,000 81,000  
Effect of movements in exchange rates   (4,000) 28,000  
Provisions 248,000 191,000 248,000 813,000
Warranty provision        
Disclosure of other provisions [line items]        
Provisions made during the year   5,474,000 4,540,000  
New additions to provision   4,414,000 4,057,000  
Upward adjustments / increase in provision   1,060,000 483,000  
Expenditures   1,409,000 905,000  
Downward adjustments / provision eliminated   208,000 1,198,000  
Effect of movements in exchange rates   (4,000) 7,000  
Provisions $ 5,199,000 9,052,000 5,199,000 2,755,000
Decommissioning liabilities        
Disclosure of other provisions [line items]        
Provisions made during the year   (63,000) 111,000  
New additions to provision   36,000 111,000  
Expenditures   0 0  
Downward adjustments / provision eliminated   0 0  
Effect of movements in exchange rates   $ (328,000) $ 278,000  
Estimated future cash flows discounted percentage 2.26% 2.18% 2.26%  
Undiscounted amount of the estimated cash flows $ 1,773,000 $ 1,825,000 $ 1,773,000  
Provisions $ 4,253,000 3,862,000 $ 4,253,000 $ 3,864,000
Other - Deferred lease inducement        
Disclosure of other provisions [line items]        
Downward adjustments / provision eliminated   2,768,000    
Lease term, extension 10 years      
Provisions   $ 2,292,000