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Other Financial Liabilities (debt) (Details Textual) - USD ($)
 1 Months Ended 12 Months Ended
Mar. 28, 2018
Jun. 30, 2017
Jun. 27, 2016
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Mar. 31, 2014
Disclosure Of Other Financial Liabilities debt [Line Items]              
Notional amount     $ 275,000,000 $ 275,000,000 $ 275,000,000    
Borrowings       $ 271,382,000 272,575,000    
Borrowings, interest rate basis three months plus 2.15%   Three-month Libor plus 3%        
Description of amortization of credit facility       The credit facility calls for amortization in four installments, with 15% of the total facility due on December 31, 2020 (fully repaid as of December 31, 2018), 15% due on June 30, 2021 (fully repaid as of December 31, 2018), 35% due on December 31, 2021 (US$505 million after the December 2018 repayment) and 35% due on June 19, 2022 (US$525 million).      
Repayments of borrowings, classified as financing activities       $ 95,000,000 300,000,000 $ 442,957,000  
Write off debt issuance costs       1,900,000 6,300,000    
Senior unsecured credit facility [Member]              
Disclosure Of Other Financial Liabilities debt [Line Items]              
Borrowings   $ 1,500,000,000     $ 220,000,000    
Repayments of borrowings, classified as financing activities       $ 470,000,000      
Increased in Credit Facility   $ 225,000,000          
Citi bank [Member] | Senior unsecured credit facility [Member]              
Disclosure Of Other Financial Liabilities debt [Line Items]              
Notional amount             $ 1,800,000,000
Citi bank [Member] | Term loan [Member]              
Disclosure Of Other Financial Liabilities debt [Line Items]              
Borrowings, interest rate basis       Interest on the credit facility is based on the London Interbank Offered Rate (LIBOR) plus a spread (currently 1.9%) based on the Company´s total net debt to earnings before interest, taxes, depreciation and amortization (EBITDA) ratio, as defined in the agreement.      
Sociedad Minera El Brocal S.A.A. [Member] | Citi bank [Member]              
Disclosure Of Other Financial Liabilities debt [Line Items]              
Borrowings, interest rate basis       Interest on the credit facility is based on the London Interbank Offered Rate (LIBOR) plus a spread (currently 1.9%) based on the Company´s total net debt to earnings before interest, taxes, depreciation and amortization (EBITDA) ratio, as defined in the agreement.