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INCOME TAXES: (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
INCOME TAXES:          
Income tax provision $ 125,336 $ 175,405 $ 411,571 $ 605,336  
Effective income tax rate (as a percent)     38.10% 38.40%  
Income Taxes          
Statutory income tax provision     $ 366,800 $ 505,500  
Peruvian royalty     3,000 6,600  
Mexican royalty     22,800 64,900  
Peruvian special mining tax     19,000 28,300  
Changes in the entity's uncertain tax positions $ 0   0    
Peru          
Income Taxes          
Peruvian royalty     $ 3,000 6,600  
Increment in operating income margin for royalty tax (as a percent)     5.00%    
Increase in royalty tax rate for each 5% increase up to 12% increase in operating income margin (as a percent)     0.75%    
Royalty charge     $ 18,500 25,500  
Increase in special mining tax rate for each 5% increase up to 85% increase in operating income margin (as a percent)     0.40%    
Accrued special mining tax     $ 19,000 28,300  
Income tax rate ( as a percent)         30.00%
Dividend tax rate         4.10%
Peru | Minimum          
Income Taxes          
Mining royalty tax (as a percent)     1.00%    
Royalty charge assessed as a percentage of net sales     1.00%    
Special mine tax (as a percent)     2.00%    
Increment in operating income margin (as a percent)     5.00%    
Peru | Maximum          
Income Taxes          
Mining royalty tax (as a percent)     12.00%    
Operating income margin for royalty tax (as a percent)     10.00%    
Increment in operating income margin for royalty tax (as a percent)     12.00%    
Special mine tax (as a percent)     8.40%    
Operating income margin (as a percent)     10.00%    
Increment in operating income margin (as a percent)     85.00%    
Mexico          
Income Taxes          
Mexican royalty     $ 22,800 $ 64,900  
Mining royalty tax (as a percent)     7.50%    
Additional royalty tax over net sales from sales of gold, silver and platinum (as a percent)     0.50%    
2015 - 2016          
Income Taxes          
Income tax rate ( as a percent)         28.00%
Dividend tax rate         6.80%
2017 - 2018          
Income Taxes          
Income tax rate ( as a percent)         27.00%
Dividend tax rate         8.00%
2019 and later          
Income Taxes          
Income tax rate ( as a percent)         26.00%
Dividend tax rate         9.30%