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INCOME TAXES: (Details) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
U.S. federal and state:      
Current   $ (100,000) $ (2,400,000)
Deferred (139,300,000) (108,600,000) (45,300,000)
Uncertain tax positions   147,400,000 (400,000)
Provision for income taxes (139,300,000) 38,700,000 (48,100,000)
Foreign (Peru and Mexico):      
Current 866,300,000 1,025,100,000 1,238,700,000
Deferred 42,300,000 17,100,000 (86,300,000)
Provision for income taxes 908,600,000 1,042,200,000 1,152,400,000
Total provision for income taxes 769,322,000 1,080,872,000 1,104,335,000
Earnings by location:      
U.S. 100,000 (100,000) (1,100,000)
Peru 773,800,000 846,000,000 1,351,900,000
Mexico 1,598,700,000 2,127,600,000 2,097,900,000
Foreign 2,372,500,000 2,973,600,000 3,449,800,000
Income before income taxes $ 2,372,598,000 $ 2,973,542,000 $ 3,448,688,000