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Intangible assets and goodwill (Details 1) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure Of Intangible Assets And Goodwill [Line Items]        
Intangible assets other than goodwill $ 188,283 $ 113,787 $ 109,439  
Total intangible assets and goodwill 223,001 151,759 147,411 $ 148,816
Gross carrying amount [member]        
Disclosure Of Intangible Assets And Goodwill [Line Items]        
Intangible assets other than goodwill 216,863 134,617    
Total intangible assets and goodwill 254,835 172,589 164,668 167,059
Accumulated depreciation, amortisation and impairment [member]        
Disclosure Of Intangible Assets And Goodwill [Line Items]        
Intangible assets other than goodwill (26,639) (20,830)    
Total intangible assets and goodwill (26,639) (20,830)    
Accumulated impairment [member]        
Disclosure Of Intangible Assets And Goodwill [Line Items]        
Intangible assets other than goodwill (1,941)      
Total intangible assets and goodwill $ (5,195)      
Indeifinite Intangible assets [Member]        
Disclosure Of Intangible Assets And Goodwill [Line Items]        
Intangible assets other than goodwill   $ 113,787    
Computer software [member] | Finite intangible assets [Member]        
Disclosure Of Intangible Assets And Goodwill [Line Items]        
Useful life Finite Finite    
Intangible assets other than goodwill $ 3,378 $ 5,291    
Total intangible assets and goodwill 3,378 5,291 7,046 9,813
Computer software [member] | Gross carrying amount [member] | Finite intangible assets [Member]        
Disclosure Of Intangible Assets And Goodwill [Line Items]        
Intangible assets other than goodwill 28,833 25,060    
Total intangible assets and goodwill 1,254 25,060 23,280 23,251
Computer software [member] | Accumulated depreciation, amortisation and impairment [member] | Finite intangible assets [Member]        
Disclosure Of Intangible Assets And Goodwill [Line Items]        
Intangible assets other than goodwill (25,455) $ (19,769)    
Computer software [member] | Accumulated impairment [member] | Finite intangible assets [Member]        
Disclosure Of Intangible Assets And Goodwill [Line Items]        
Intangible assets other than goodwill $ 0      
Copyrights, patents and other industrial property rights, service and operating rights [member] | Finite intangible assets [Member]        
Disclosure Of Intangible Assets And Goodwill [Line Items]        
Useful life Finite Finite    
Intangible assets other than goodwill $ 151 $ 189    
Total intangible assets and goodwill   189 460 464
Copyrights, patents and other industrial property rights, service and operating rights [member] | Gross carrying amount [member] | Finite intangible assets [Member]        
Disclosure Of Intangible Assets And Goodwill [Line Items]        
Intangible assets other than goodwill 1,254 1,250    
Total intangible assets and goodwill 184,849 1,250 1,483 1,448
Copyrights, patents and other industrial property rights, service and operating rights [member] | Accumulated depreciation, amortisation and impairment [member] | Finite intangible assets [Member]        
Disclosure Of Intangible Assets And Goodwill [Line Items]        
Intangible assets other than goodwill (1,096) (1,061)    
Copyrights, patents and other industrial property rights, service and operating rights [member] | Accumulated impairment [member] | Finite intangible assets [Member]        
Disclosure Of Intangible Assets And Goodwill [Line Items]        
Intangible assets other than goodwill (7)      
Copyrights, patents and other industrial property rights, service and operating rights [member] | Indeifinite Intangible assets [Member]        
Disclosure Of Intangible Assets And Goodwill [Line Items]        
Total intangible assets and goodwill $ 151 $ 189 98,596 96,500
Goodwill [Member]        
Disclosure Of Intangible Assets And Goodwill [Line Items]        
Useful life   Indefinite    
Intangible assets other than goodwill   $ 37,972    
Goodwill [Member] | Gross carrying amount [member]        
Disclosure Of Intangible Assets And Goodwill [Line Items]        
Intangible assets other than goodwill   37,972    
Goodwill [Member] | Accumulated depreciation, amortisation and impairment [member]        
Disclosure Of Intangible Assets And Goodwill [Line Items]        
Intangible assets other than goodwill   0    
Goodwill [Member] | Indeifinite Intangible assets [Member]        
Disclosure Of Intangible Assets And Goodwill [Line Items]        
Useful life Indefinite      
Intangible assets other than goodwill $ 34,718 37,972    
Goodwill [Member] | Indeifinite Intangible assets [Member] | Gross carrying amount [member]        
Disclosure Of Intangible Assets And Goodwill [Line Items]        
Intangible assets other than goodwill 37,972      
Goodwill [Member] | Indeifinite Intangible assets [Member] | Accumulated depreciation, amortisation and impairment [member]        
Disclosure Of Intangible Assets And Goodwill [Line Items]        
Intangible assets other than goodwill 0      
Goodwill [Member] | Indeifinite Intangible assets [Member] | Accumulated impairment [member]        
Disclosure Of Intangible Assets And Goodwill [Line Items]        
Intangible assets other than goodwill (3,254)      
Mining Property Water Rights And Rights Of Way [Member]        
Disclosure Of Intangible Assets And Goodwill [Line Items]        
Total intangible assets and goodwill $ 183,032 106,358    
Mining Property Water Rights And Rights Of Way [Member] | Finite intangible assets [Member]        
Disclosure Of Intangible Assets And Goodwill [Line Items]        
Total intangible assets and goodwill   106,358 106,436  
Mining Property Water Rights And Rights Of Way [Member] | Gross carrying amount [member] | Finite intangible assets [Member]        
Disclosure Of Intangible Assets And Goodwill [Line Items]        
Total intangible assets and goodwill   $ 106,358 106,436  
Mining Property Water Rights And Rights Of Way [Member] | Indeifinite Intangible assets [Member]        
Disclosure Of Intangible Assets And Goodwill [Line Items]        
Useful life Indefinite Indefinite    
Intangible assets other than goodwill $ 183,032 $ 106,358    
Mining Property Water Rights And Rights Of Way [Member] | Indeifinite Intangible assets [Member] | Gross carrying amount [member]        
Disclosure Of Intangible Assets And Goodwill [Line Items]        
Intangible assets other than goodwill 184,849 106,358    
Total intangible assets and goodwill 98,596 96,500
Mining Property Water Rights And Rights Of Way [Member] | Indeifinite Intangible assets [Member] | Accumulated depreciation, amortisation and impairment [member]        
Disclosure Of Intangible Assets And Goodwill [Line Items]        
Intangible assets other than goodwill (88) $ 0    
Mining Property Water Rights And Rights Of Way [Member] | Indeifinite Intangible assets [Member] | Accumulated impairment [member]        
Disclosure Of Intangible Assets And Goodwill [Line Items]        
Intangible assets other than goodwill $ (1,729)      
Customer-related intangible assets [member] | Finite intangible assets [Member]        
Disclosure Of Intangible Assets And Goodwill [Line Items]        
Total intangible assets and goodwill     2,942  
Customer-related intangible assets [member] | Indeifinite Intangible assets [Member]        
Disclosure Of Intangible Assets And Goodwill [Line Items]        
Useful life Indefinite Indefinite    
Intangible assets other than goodwill $ 1,573 $ 1,778    
Total intangible assets and goodwill 1,573 1,778    
Customer-related intangible assets [member] | Indeifinite Intangible assets [Member] | Gross carrying amount [member]        
Disclosure Of Intangible Assets And Goodwill [Line Items]        
Intangible assets other than goodwill 1,778 1,778    
Total intangible assets and goodwill 1,778 1,778 2,942 3,651
Customer-related intangible assets [member] | Indeifinite Intangible assets [Member] | Accumulated depreciation, amortisation and impairment [member]        
Disclosure Of Intangible Assets And Goodwill [Line Items]        
Intangible assets other than goodwill 0 0    
Customer-related intangible assets [member] | Indeifinite Intangible assets [Member] | Accumulated impairment [member]        
Disclosure Of Intangible Assets And Goodwill [Line Items]        
Intangible assets other than goodwill $ (205)      
Other Intangible Assets [Member] | Gross carrying amount [member]        
Disclosure Of Intangible Assets And Goodwill [Line Items]        
Intangible assets other than goodwill   1,778    
Other Intangible Assets [Member] | Gross carrying amount [member] | Finite intangible assets [Member]        
Disclosure Of Intangible Assets And Goodwill [Line Items]        
Intangible assets other than goodwill   $ 171    
Other Intangible Assets [Member] | Indeifinite Intangible assets [Member]        
Disclosure Of Intangible Assets And Goodwill [Line Items]        
Useful life Indefinite Indefinite    
Intangible assets other than goodwill $ 149 $ 171    
Total intangible assets and goodwill 149 171 3,337 $ 3,651
Other Intangible Assets [Member] | Indeifinite Intangible assets [Member] | Gross carrying amount [member]        
Disclosure Of Intangible Assets And Goodwill [Line Items]        
Intangible assets other than goodwill 149 171    
Total intangible assets and goodwill 149 171 $ 0  
Other Intangible Assets [Member] | Indeifinite Intangible assets [Member] | Accumulated depreciation, amortisation and impairment [member]        
Disclosure Of Intangible Assets And Goodwill [Line Items]        
Intangible assets other than goodwill 0 $ 0    
Other Intangible Assets [Member] | Indeifinite Intangible assets [Member] | Accumulated impairment [member]        
Disclosure Of Intangible Assets And Goodwill [Line Items]        
Intangible assets other than goodwill $ 0