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Intangible assets and goodwill (Details 1) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure Of Intangible Assets And Goodwill [Line Items]      
Intangible assets other than goodwill $ 188,358 $ 189,350  
Goodwill 34,726 34,866 $ 37,972
Total intangible assets and goodwill $ 223,084 $ 224,216 151,759
Finite intangible assets [Member]      
Disclosure Of Intangible Assets And Goodwill [Line Items]      
Useful life Finite Finite  
Intangible assets other than goodwill $ 1,294 $ 1,412  
Gross carrying amount [member]      
Disclosure Of Intangible Assets And Goodwill [Line Items]      
Intangible assets other than goodwill 222,197 217,929  
Goodwill 38,120 38,120 37,972
Total intangible assets and goodwill 260,317 256,049 172,589
Gross carrying amount [member] | Finite intangible assets [Member]      
Disclosure Of Intangible Assets And Goodwill [Line Items]      
Intangible assets other than goodwill 1,500 1,500  
Accumulated depreciation, amortisation and impairment [member]      
Disclosure Of Intangible Assets And Goodwill [Line Items]      
Intangible assets other than goodwill (31,190) (26,843)  
Total intangible assets and goodwill (31,190) (26,843)  
Accumulated depreciation, amortisation and impairment [member] | Finite intangible assets [Member]      
Disclosure Of Intangible Assets And Goodwill [Line Items]      
Intangible assets other than goodwill (206) (88)  
Accumulated impairment [member]      
Disclosure Of Intangible Assets And Goodwill [Line Items]      
Intangible assets other than goodwill (2,649) (1,736)  
Goodwill (3,394) (3,254) 0
Total intangible assets and goodwill (6,043) (4,990)  
Accumulated impairment [member] | Finite intangible assets [Member]      
Disclosure Of Intangible Assets And Goodwill [Line Items]      
Intangible assets other than goodwill $ 0 $ 0  
Indeifinite Intangible assets [Member]      
Disclosure Of Intangible Assets And Goodwill [Line Items]      
Useful life   Indefinite  
Intangible assets other than goodwill   $ 34,866  
Indeifinite Intangible assets [Member] | Gross carrying amount [member]      
Disclosure Of Intangible Assets And Goodwill [Line Items]      
Intangible assets other than goodwill   38,120  
Indeifinite Intangible assets [Member] | Accumulated depreciation, amortisation and impairment [member]      
Disclosure Of Intangible Assets And Goodwill [Line Items]      
Intangible assets other than goodwill   0  
Indeifinite Intangible assets [Member] | Accumulated impairment [member]      
Disclosure Of Intangible Assets And Goodwill [Line Items]      
Intangible assets other than goodwill   $ (3,254)  
Computer software [member] | Finite intangible assets [Member]      
Disclosure Of Intangible Assets And Goodwill [Line Items]      
Useful life Finite Finite  
Intangible assets other than goodwill $ 6,011 $ 4,568  
Total intangible assets and goodwill 6,011 4,568 5,291
Computer software [member] | Gross carrying amount [member] | Finite intangible assets [Member]      
Disclosure Of Intangible Assets And Goodwill [Line Items]      
Intangible assets other than goodwill 34,471 29,137  
Total intangible assets and goodwill 34,471 29,137 25,060
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 (28,460) (24,569)  
Computer software [member] | Accumulated impairment [member] | Finite intangible assets [Member]      
Disclosure Of Intangible Assets And Goodwill [Line Items]      
Intangible assets other than goodwill $ 0 $ 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 $ 121 $ 151  
Total intangible assets and goodwill 121 151 189
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 1,259 1,254  
Total intangible assets and goodwill 1,259 1,254 1,250
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 (1,131) (1,096)  
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) (7)  
Goodwill [Member]      
Disclosure Of Intangible Assets And Goodwill [Line Items]      
Goodwill 34,726    
Goodwill [Member] | Gross carrying amount [member]      
Disclosure Of Intangible Assets And Goodwill [Line Items]      
Goodwill 38,120    
Goodwill [Member] | Accumulated depreciation, amortisation and impairment [member]      
Disclosure Of Intangible Assets And Goodwill [Line Items]      
Goodwill 0    
Goodwill [Member] | Accumulated impairment [member]      
Disclosure Of Intangible Assets And Goodwill [Line Items]      
Goodwill $ (3,394)    
Goodwill [Member] | Indeifinite Intangible assets [Member]      
Disclosure Of Intangible Assets And Goodwill [Line Items]      
Useful life Indefinite    
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 $ 182,260 $ 183,349  
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 $ 179,618 $ 181,620  
Total intangible assets and goodwill 179,618 181,620 104,858
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 182,260 183,349  
Total intangible assets and goodwill   183,349 104,858
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 0 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 $ (2,642) $ (1,729)  
Customer-related intangible assets [member] | Finite intangible assets [Member]      
Disclosure Of Intangible Assets And Goodwill [Line Items]      
Useful life Finite Finite  
Intangible assets other than goodwill $ 1,273 $ 1,573  
Total intangible assets and goodwill 1,273 1,573 1,778
Customer-related intangible assets [member] | Gross carrying amount [member] | Finite intangible assets [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 1,778
Customer-related intangible assets [member] | Accumulated depreciation, amortisation and impairment [member] | Finite intangible assets [Member]      
Disclosure Of Intangible Assets And Goodwill [Line Items]      
Intangible assets other than goodwill (505) (205)  
Customer-related intangible assets [member] | Accumulated impairment [member] | Finite intangible assets [Member]      
Disclosure Of Intangible Assets And Goodwill [Line Items]      
Intangible assets other than goodwill $ 0 $ 0  
Other Intangible Assets [Member] | Finite intangible assets [Member]      
Disclosure Of Intangible Assets And Goodwill [Line Items]      
Useful life Finite Finite  
Intangible assets other than goodwill $ 41 $ 26  
Total intangible assets and goodwill 41 26 171
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 929 911  
Total intangible assets and goodwill 929 911 $ 171
Other Intangible Assets [Member] | Accumulated depreciation, amortisation and impairment [member] | Finite intangible assets [Member]      
Disclosure Of Intangible Assets And Goodwill [Line Items]      
Intangible assets other than goodwill (888) (885)  
Other Intangible Assets [Member] | Accumulated impairment [member] | Finite intangible assets [Member]      
Disclosure Of Intangible Assets And Goodwill [Line Items]      
Intangible assets other than goodwill $ 0 $ 0