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INCOME TAXES: (Details 4)
 12 Months Ended 1 Months Ended 12 Months Ended 3 Months Ended 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
USD ($)
Dec. 31, 2011
USD ($)
Dec. 31, 2010
USD ($)
Dec. 31, 2009
USD ($)
Dec. 31, 2011
United States
Minera Mexico
USD ($)
Mar. 31, 2011
Mexican Operations.
USD ($)
Mar. 31, 2011
Mexican Operations.
MXN
Jun. 30, 2010
Mexican Operations.
USD ($)
Jun. 30, 2010
Mexican Operations.
MXN
Dec. 31, 2011
Mexican Operations.
Dec. 31, 2009
Mexican Operations.
USD ($)
Y
Dec. 31, 2011
Peru
USD ($)
Dec. 31, 2011
Peru
Dec. 31, 2011
Peru
Maximum
Dec. 31, 2011
Peru
Minimum
Income Taxes                                  
Corporate flat tax rate (as a percent)                       17.50%          
Excess of financial reporting over tax basis for stock in subsidiary             $ 2,900,000,000                    
Deferred tax liability potentially remitted foreign earnings             91,600,000                    
Foreign earnings potentially repatriated             951,000,000                    
Special mining tax (as a percent)                               8.40% 2.00%
Operating income margin (as a percent)                             10.00%    
Increment in operating income margin (as a percent)                               85.00% 5.00%
Increase in royalty tax rate for each 5% increase up to 85% increase in operating income margin (as a percent)                             0.40%    
Provision for special mining tax                           16,400,000      
Net operating loss carryforward period before enactment of new tax laws (in years)                         10        
Net operating loss carryforward period (in years)                         5        
Additional tax liability due to enactment of new tax laws                         106,600,000        
Income tax expenses attributable to enactment of new tax laws                         22,600,000        
Amount of additional tax liability recognized as deferred tax charge                         84,000,000        
Tax payments       1,234,453,000 600,371,000 339,421,000   9,300,000 125,000,000 10,000,000 121,000,000            
Mexican tax rate (as a percent) 28.00% 29.00% 30.00% 30.00% 30.00% 28.00%                      
Changes in unrecognized tax benefits                                  
Unrecognized tax benefits, opening balance     70,600,000 75,700,000 30,700,000 64,900,000                      
Gross increases tax positions in prior period       21,600,000 46,300,000                        
Gross decreases tax positions in prior period       (26,800,000) (1,800,000) (44,100,000)                      
Gross increases current-period tax positions       100,000 500,000 11,400,000                      
Decreases related to settlements with taxing authorities           (1,500,000)                      
Unrecognized tax benefits, ending balance       70,600,000 75,700,000 30,700,000                      
Overall decrease in unrecognized tax benefit       5,100,000                          
Amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate       52,900,000 35,500,000                        
Accrued interest and penalties included in liability for uncertain tax positions         $ 8,000,000