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Intangible assets and goodwill (Details 4) - USD ($)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure Of Intangible Assets And Goodwill [Line Items]      
Opening balance $ 151,759,000 $ 147,411,000 $ 148,816,000
Additions 78,376,000 1,118,000 2,285,000
Increases (decreases) for transfers 0 (205,000)  
Other increases / decreases for foreign currency exchange rates (6,000)    
Impairment (5,195,000) 0  
Transferred to available for sale 0    
Other increases (decreases) 1,070,000 (1,319,000) (856,000)
Amortization (3,003,000) (2,691,000) (2,834,000)
Total increases (decreases) 71,242,000 (3,097,000)  
Final balance 223,001,000 151,759,000 147,411,000
Finite intangible assets [Member] | Goodwill [Member]      
Disclosure Of Intangible Assets And Goodwill [Line Items]      
Opening balance 37,972,000    
Additions 0    
Increases (decreases) for transfers 0    
Other increases / decreases for foreign currency exchange rates 0    
Impairment (3,254,000)    
Transferred to available for sale 0    
Other increases (decreases) 0    
Amortization 0    
Total increases (decreases) (3,254,000)    
Final balance 34,718,000 37,972,000  
Gross carrying amount [member]      
Disclosure Of Intangible Assets And Goodwill [Line Items]      
Opening balance 172,589,000 164,668,000 167,059,000
Additions 78,376,000 1,118,000 2,285,000
Increases (decreases) for transfers 0 (205,000)  
Other increases / decreases for foreign currency exchange rates (10,000)    
Impairment 0 0  
Transferred to available for sale 0    
Other increases (decreases) 3,880,000 (437,000) (4,676,000)
Total increases (decreases) 82,246,000 476,000  
Final balance 254,835,000 172,589,000 164,668,000
Accumulated depreciation and amortisation [member]      
Disclosure Of Intangible Assets And Goodwill [Line Items]      
Opening balance (20,830,000) (17,257,000) (18,243,000)
Additions 0 0 0
Other increases / decreases for foreign currency exchange rates 4,000    
Impairment (5,195,000)    
Other increases (decreases) (2,810,000) (882,000) 3,820,000
Amortization (3,003,000) (2,691,000) (2,834,000)
Total increases (decreases) (11,004,000) (3,573,000)  
Final balance (31,834,000) (20,830,000) (17,257,000)
Accumulated depreciation and amortisation [member] | Finite intangible assets [Member]      
Disclosure Of Intangible Assets And Goodwill [Line Items]      
Opening balance 0    
Additions 0    
Other increases / decreases for foreign currency exchange rates 0    
Impairment (1,729,000)    
Other increases (decreases) 0    
Amortization (88,000)    
Total increases (decreases) (1,817,000)    
Final balance (1,817,000) 0  
Accumulated depreciation and amortisation [member] | Finite intangible assets [Member] | Goodwill [Member]      
Disclosure Of Intangible Assets And Goodwill [Line Items]      
Opening balance 0    
Additions 0    
Other increases / decreases for foreign currency exchange rates 0    
Impairment (3,254,000)    
Other increases (decreases) 0    
Amortization 0    
Total increases (decreases) (3,254,000)    
Final balance (3,254,000) 0  
Indeifinite Intangible assets [Member] | Goodwill [Member]      
Disclosure Of Intangible Assets And Goodwill [Line Items]      
Opening balance 37,972,000 37,972,000 38,388,000
Additions   0 0
Increases (decreases) for transfers   0  
Impairment   0  
Other increases (decreases)   0 (416,000)
Amortization   0 0
Total increases (decreases)   0  
Final balance   37,972,000 37,972,000
Indeifinite Intangible assets [Member] | Gross carrying amount [member] | Goodwill [Member]      
Disclosure Of Intangible Assets And Goodwill [Line Items]      
Opening balance 37,972,000 37,972,000 38,388,000
Additions 0 0 0
Increases (decreases) for transfers 0 0  
Other increases / decreases for foreign currency exchange rates 0    
Impairment 0 0  
Transferred to available for sale 0    
Other increases (decreases) 0 0 (416,000)
Total increases (decreases) 0 0  
Final balance 37,972 37,972,000 37,972,000
Indeifinite Intangible assets [Member] | Accumulated depreciation and amortisation [member] | Goodwill [Member]      
Disclosure Of Intangible Assets And Goodwill [Line Items]      
Opening balance 0 0 0
Additions   0 0
Other increases (decreases)   0 0
Amortization   0 0
Total increases (decreases)   0  
Final balance   0 0
Brand names [member] | Finite intangible assets [Member]      
Disclosure Of Intangible Assets And Goodwill [Line Items]      
Opening balance   0 0
Additions     0
Other increases (decreases)     0
Amortization     0
Final balance     0
Brand names [member] | Gross carrying amount [member] | Finite intangible assets [Member]      
Disclosure Of Intangible Assets And Goodwill [Line Items]      
Opening balance 25,060,000 0 3,821,000
Additions 1,159,000   0
Increases (decreases) for transfers 0    
Other increases / decreases for foreign currency exchange rates (5,000)    
Impairment 0    
Transferred to available for sale 0    
Other increases (decreases) 2,619,000   (3,821,000)
Total increases (decreases) 3,773,000    
Final balance 28,833,000 25,060,000 0
Brand names [member] | Accumulated depreciation and amortisation [member] | Finite intangible assets [Member]      
Disclosure Of Intangible Assets And Goodwill [Line Items]      
Opening balance   0 (3,821,000)
Additions     0
Other increases (decreases)     3,821,000
Amortization     0
Final balance     0
Computer software [member] | Finite intangible assets [Member]      
Disclosure Of Intangible Assets And Goodwill [Line Items]      
Opening balance 5,291,000 7,046,000 9,813,000
Additions 1,159,000 939,000 160,000
Increases (decreases) for transfers 0 0  
Other increases / decreases for foreign currency exchange rates (1,000)    
Impairment 0 0  
Transferred to available for sale 0    
Other increases (decreases) (191,000) (41,000) (131,000)
Amortization (2,880,000) (2,653,000) (2,796,000)
Total increases (decreases) (1,913,000) (1,755,000)  
Final balance 3,378,000 5,291,000 7,046,000
Computer software [member] | Gross carrying amount [member] | Finite intangible assets [Member]      
Disclosure Of Intangible Assets And Goodwill [Line Items]      
Opening balance 25,060,000 23,280,000 23,251,000
Additions 5,000 939,000 160,000
Increases (decreases) for transfers 0 0  
Other increases / decreases for foreign currency exchange rates (1,000)    
Impairment 0 0  
Transferred to available for sale 0    
Other increases (decreases) 0 841,000 (131,000)
Total increases (decreases) 4,000 1,780,000  
Final balance 1,254,000 25,060,000 23,280,000
Computer software [member] | Accumulated depreciation and amortisation [member] | Finite intangible assets [Member]      
Disclosure Of Intangible Assets And Goodwill [Line Items]      
Opening balance (19,769,000) (16,234,000) (13,438,000)
Additions 0 0 0
Other increases / decreases for foreign currency exchange rates 4,000    
Impairment 0    
Other increases (decreases) (2,810,000) (882,000) 0
Amortization (2,880,000) (2,653,000) (2,796,000)
Total increases (decreases) (5,686,000) (3,535,000)  
Final balance (25,455,000) (19,769,000) (16,234,000)
Copyrights, patents and other industrial property rights, service and operating rights [member] | Finite intangible assets [Member]      
Disclosure Of Intangible Assets And Goodwill [Line Items]      
Opening balance 189,000 460,000 464,000
Additions   8,000 25,000
Increases (decreases) for transfers   0  
Impairment   0  
Other increases (decreases)   (241,000) 9,000
Amortization   (38,000) (38,000)
Total increases (decreases)   (271,000)  
Final balance   189,000 460,000
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]      
Opening balance 1,250,000 1,483,000 1,448,000
Additions 77,201,000 8,000 25,000
Increases (decreases) for transfers 0 0  
Other increases / decreases for foreign currency exchange rates (4,000)    
Impairment 0 0  
Transferred to available for sale 0    
Other increases (decreases) 1,294,000 (241,000) 10,000
Total increases (decreases) 78,491,000 (233,000)  
Final balance 184,849,000 1,250,000 1,483,000
Copyrights, patents and other industrial property rights, service and operating rights [member] | Accumulated depreciation and amortisation [member] | Finite intangible assets [Member]      
Disclosure Of Intangible Assets And Goodwill [Line Items]      
Opening balance (1,061,000) (1,023,000) (984,000)
Additions 0 0 0
Other increases / decreases for foreign currency exchange rates 0    
Impairment (7,000)    
Other increases (decreases) 0 0 (1,000)
Amortization (35,000) (38,000) (38,000)
Total increases (decreases) (42,000) (38,000)  
Final balance (1,103,000) (1,061,000) (1,023,000)
Copyrights, patents and other industrial property rights, service and operating rights [member] | Indeifinite Intangible assets [Member]      
Disclosure Of Intangible Assets And Goodwill [Line Items]      
Opening balance 189,000 98,596,000 96,500,000
Additions 5,000   2,100,000
Increases (decreases) for transfers 0    
Other increases / decreases for foreign currency exchange rates (1,000)    
Impairment (7,000)    
Transferred to available for sale 0    
Other increases (decreases) 0   (4,000)
Amortization (35,000)   0
Total increases (decreases) (38,000)    
Final balance 151,000 189,000 98,596,000
Mining Property Water Rights And Rights Of Way [Member]      
Disclosure Of Intangible Assets And Goodwill [Line Items]      
Opening balance 106,358,000    
Additions 77,201,000    
Increases (decreases) for transfers 0    
Other increases / decreases for foreign currency exchange rates (4,000)    
Impairment (1,729,000)    
Transferred to available for sale 0    
Other increases (decreases) 1,294,000    
Amortization (88,000)    
Total increases (decreases) 76,674,000    
Final balance 183,032,000 106,358,000  
Mining Property Water Rights And Rights Of Way [Member] | Finite intangible assets [Member]      
Disclosure Of Intangible Assets And Goodwill [Line Items]      
Opening balance 106,358,000 106,436,000  
Increases (decreases) for transfers   (205,000)  
Impairment   0  
Other increases (decreases)   127,000  
Amortization   0  
Total increases (decreases)   (78,000)  
Final balance   106,358,000 106,436,000
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]      
Opening balance 106,358,000 106,436,000  
Additions   0  
Increases (decreases) for transfers   (205,000)  
Impairment   0  
Other increases (decreases)   127,000  
Total increases (decreases)   (78,000)  
Final balance   106,358,000 106,436,000
Mining Property Water Rights And Rights Of Way [Member] | Accumulated depreciation and amortisation [member] | Finite intangible assets [Member]      
Disclosure Of Intangible Assets And Goodwill [Line Items]      
Opening balance 0 0  
Additions   0  
Other increases (decreases)   0  
Amortization   0  
Total increases (decreases)   0  
Final balance   0 0
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]      
Opening balance 98,596,000 96,500,000
Additions   2,100,000
Increases (decreases) for transfers    
Other increases / decreases for foreign currency exchange rates    
Impairment    
Transferred to available for sale    
Other increases (decreases)   (4,000)
Total increases (decreases)    
Final balance 98,596,000
Mining Property Water Rights And Rights Of Way [Member] | Indeifinite Intangible assets [Member] | Accumulated depreciation and amortisation [member]      
Disclosure Of Intangible Assets And Goodwill [Line Items]      
Opening balance 0 0
Additions   0
Other increases / decreases for foreign currency exchange rates    
Impairment    
Other increases (decreases)   0
Amortization   0
Total increases (decreases)    
Final balance 0
Customer-related intangible assets [member] | Finite intangible assets [Member]      
Disclosure Of Intangible Assets And Goodwill [Line Items]      
Opening balance   2,942,000  
Increases (decreases) for transfers    
Final balance     2,942,000
Customer-related intangible assets [member] | Indeifinite Intangible assets [Member]      
Disclosure Of Intangible Assets And Goodwill [Line Items]      
Opening balance 1,778,000    
Additions 0    
Increases (decreases) for transfers   0  
Other increases / decreases for foreign currency exchange rates 0    
Impairment (205,000) 0  
Transferred to available for sale 0    
Other increases (decreases) 0 (1,164,000)  
Amortization 0 0  
Total increases (decreases) (205,000) (1,164,000)  
Final balance 1,573,000 1,778,000  
Customer-related intangible assets [member] | Indeifinite Intangible assets [Member] | Gross carrying amount [member]      
Disclosure Of Intangible Assets And Goodwill [Line Items]      
Opening balance 1,778,000 2,942,000 3,651,000
Additions 0 0 0
Increases (decreases) for transfers 0 0  
Other increases / decreases for foreign currency exchange rates 0    
Impairment 0 0  
Transferred to available for sale 0    
Other increases (decreases) 0 (1,164,000) (314,000)
Total increases (decreases) 1,778,000 (1,164,000)  
Final balance 1,778,000 1,778,000 2,942,000
Customer-related intangible assets [member] | Indeifinite Intangible assets [Member] | Accumulated depreciation and amortisation [member]      
Disclosure Of Intangible Assets And Goodwill [Line Items]      
Opening balance 0 0
Additions 0 0 0
Other increases / decreases for foreign currency exchange rates 0    
Impairment (205,000)    
Other increases (decreases) 0 0 0
Amortization 0 0 0
Total increases (decreases) (205,000) 0  
Final balance (205,000) 0
Other Intangible Assets [Member] | Accumulated depreciation and amortisation [member] | Finite intangible assets [Member]      
Disclosure Of Intangible Assets And Goodwill [Line Items]      
Opening balance 0    
Additions 0    
Other increases / decreases for foreign currency exchange rates 0    
Impairment 0    
Other increases (decreases) 0    
Amortization 0    
Total increases (decreases) 0    
Final balance 0 0  
Other Intangible Assets [Member] | Indeifinite Intangible assets [Member]      
Disclosure Of Intangible Assets And Goodwill [Line Items]      
Opening balance 171,000 3,337,000 3,651,000
Additions 11,000 171,000 0
Increases (decreases) for transfers 0 0  
Other increases / decreases for foreign currency exchange rates 0    
Impairment 0 0  
Transferred to available for sale 0    
Other increases (decreases) (33,000) 0 (314,000)
Amortization 0 0 0
Total increases (decreases) (22,000) 171,000  
Final balance 149,000 171,000 3,337,000
Other Intangible Assets [Member] | Indeifinite Intangible assets [Member] | Gross carrying amount [member]      
Disclosure Of Intangible Assets And Goodwill [Line Items]      
Opening balance 171,000 0  
Additions 11,000 171,000  
Increases (decreases) for transfers 0 0  
Other increases / decreases for foreign currency exchange rates 0    
Impairment 0 0  
Transferred to available for sale 0    
Other increases (decreases) (33,000) 0  
Total increases (decreases) (22,000) 171,000  
Final balance 149,000 171,000 0
Other Intangible Assets [Member] | Indeifinite Intangible assets [Member] | Accumulated depreciation and amortisation [member]      
Disclosure Of Intangible Assets And Goodwill [Line Items]      
Opening balance $ 0 0  
Additions   0  
Other increases (decreases)   0  
Amortization   0  
Total increases (decreases)   0  
Final balance   $ 0 $ 0