XML 52 R84.htm IDEA: XBRL DOCUMENT v3.20.1
Property, plant and equipment - Additional Information (Details)
$ in Thousands
 12 Months Ended
Sep. 30, 2018
USD ($)
Dec. 31, 2019
USD ($)
$ / oz
Dec. 31, 2018
USD ($)
Disclosure of detailed information about property, plant and equipment [line items]      
Capitalized interest   $ 3,848 $ 36,750
GREECE      
Disclosure of detailed information about property, plant and equipment [line items]      
Impairment loss recognised in profit or loss, property, plant and equipment     330,238
Impairment loss recognised in profit or loss, property, plant and equipment, net of deferred tax     $ 247,679
Individual assets or cash-generating units | TURKEY      
Disclosure of detailed information about property, plant and equipment [line items]      
Impairment loss recognised in profit or loss, property, plant and equipment $ 117,570 15,269  
Impairment loss recognised in profit or loss, property, plant and equipment, net of deferred tax $ 94,056 11,910  
Reversal (impairment) of property, plant and equipment   100,492  
Reversal (impairment) of property, plant and equipment, net of deferred tax   $ 80,143  
Individual assets or cash-generating units | GREECE      
Disclosure of detailed information about property, plant and equipment [line items]      
Decrease in gold price per ounce leading to impairment | $ / oz   100  
Increase in discount rate leading to impairment   1.00%  
Increase in operating costs leading to impairment   10.00%  
Increase in capital costs leading to impairment   20.00%