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INCOME TAXES: (Details) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
U.S. federal and state: |  |  |
Current | $ (2,400,000) | $ (11,200,000) | $ 3,300,000
Deferred | (45,300,000) | 6,200,000 | 59,100,000
Uncertain tax positions | (400,000) | 34,800,000 | (63,600,000)
Provision for income taxes | (48,100,000) | 29,800,000 | (1,200,000)
Foreign (Peru and Mexico): |  |  |
Current | 1,238,700,000 | 843,500,000 | 463,200,000
Deferred | (86,300,000) | (5,200,000) | 7,800,000
Provision for income taxes | 1,152,400,000 | 838,300,000 | 471,000,000
Total provision for income taxes | 1,104,335,000 | 868,071,000 | 469,861,000
Earnings by location: |  |  |
U.S. | (1,100,000) | (1,000,000) | 4,200,000
Foreign (Peru and Mexico) | 3,449,800,000 | 2,431,800,000 | 1,400,200,000
Income before income taxes | $ 3,448,688,000 | $ 2,430,780,000 | $ 1,404,434,000

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