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INCOME TAXES: - Other (Details)
$ in Thousands, PEN in Millions
1 Months Ended 12 Months Ended
Mar. 31, 2016
USD ($)
Dec. 31, 2016
PEN
Dec. 31, 2016
USD ($)
item
Dec. 31, 2015
PEN
Dec. 31, 2015
USD ($)
Dec. 31, 2014
PEN
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Income Taxes                
Cash, cash equivalents, restricted cash and short-term investments     $ 600,900          
Income tax rate ( as a percent)   35.00% 35.00% 35.00% 35.00% 35.00% 35.00%  
Changes in unrecognized tax benefits                
Unrecognized tax benefits, opening balance     $ 400,000   $ 319,400   $ 221,200  
Gross increases - tax positions in prior period     3,900   36,300   55,100  
Gross increases - current-period tax positions     23,300   44,300   43,100  
Decreases related to settlements with taxing authorities     (123,200)          
Increase (decrease) in unrecognized tax benefits     (96,000)   80,600   98,200  
Unrecognized tax benefits, ending balance     304,000   400,000   $ 319,400 $ 221,200
Amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate     304,000   400,000      
Cash refund     1,500          
Increase in liability from prior years under income tax examination     224,000          
Accrued interest and penalties included in liability for uncertain tax positions     $ 1,900   1,900      
Number of major tax jurisdictions | item     3          
Minera Mexico                
Income Taxes                
Unremitted earnings available for dividends to United States     $ 470,500   $ 0      
Foreign subsidiaries                
Income Taxes                
Cash, cash equivalents, restricted cash and short-term investments     $ 509,700          
Income tax rate ( as a percent)   10.00% 10.00%          
Foreign                
Changes in unrecognized tax benefits                
Unrecognized tax benefits, ending balance     $ 295,200          
Peru                
Income Taxes                
Income tax rate ( as a percent)   28.00% 28.00% 28.00% 28.00% 30.00% 30.00% 30.00%
Royalty charge assessed as a percentage of net sales   1.00% 1.00%          
Increase in royalty tax rate for each 5% increase up to 12% increase in operating income margin (as a percent)   0.75% 0.75%          
Royalty charges | PEN   PEN 16.8   PEN 22.9   PEN 32.4    
Provision for royalty tax     $ 0   $ 2,700   $ 7,500  
Increase in special mining tax rate for each 5% increase up to 85% increase in operating income margin (as a percent)   0.40% 0.40%          
Peruvian special mining tax     $ 10,800   $ 18,100   $ 35,300  
Dividend tax rate           4.10% 4.10%  
Changes in unrecognized tax benefits                
Amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate     $ 0          
Peru | 2015 - 2016                
Income Taxes                
Income tax rate ( as a percent)   28.00% 28.00%          
Dividend tax rate   6.80% 6.80%          
Peru | 2017 and later                
Income Taxes                
Income tax rate ( as a percent)   29.50% 29.50%          
Dividend tax rate   5.00% 5.00%          
Peru | Minimum                
Income Taxes                
Mining royalty tax (as a percent)   1.00% 1.00%          
Increment in operating income margin for royalty tax (as a percent)   5.00% 5.00%          
Special mine tax (as a percent)   2.00% 2.00%          
Operating income margin (as a percent)   2.00% 2.00%          
Increment in operating income margin (as a percent)   5.00% 5.00%          
Peru | Maximum                
Income Taxes                
Mining royalty tax (as a percent)   12.00% 12.00%          
Increment in operating income margin for royalty tax (as a percent)   10.00% 10.00%          
Special mine tax (as a percent)   8.40% 8.40%          
Operating income margin (as a percent)   10.00% 10.00%          
Increment in operating income margin (as a percent)   85.00% 85.00%          
United States | Minimum | Minera Mexico                
Income Taxes                
Excess of financial reporting over tax basis for stock in subsidiary     $ 6,700,000          
Mexico                
Income Taxes                
Income tax rate ( as a percent)   30.00% 30.00% 30.00% 30.00% 30.00% 30.00%  
Mining royalty tax (as a percent)   7.50% 7.50%          
Mining royalty amount on earnings before taxes     $ 48,900          
Additional royalty tax over gross income from sales of gold, silver and platinum (as a percent)   0.50% 0.50%          
Additional royalty over sales revenue from gold, silver and platinum     $ 800          
Amount paid for cancellation of the consolidation regime $ 10              
Income tax payable due to tax consolidation     300          
Changes in unrecognized tax benefits                
Unrecognized tax benefits, ending balance     $ 0