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DERIVATIVE INSTRUMENTS: (Details) (USD $) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2011 | Jun. 30, 2011
DERIVATIVE INSTRUMENTS: |  |
Minimum correlation coefficient between average monthly copper prices on LME and COMEX exchanges | 99.90% | 99.90%
Copper derivative activity related to copper sales transactions |  |
Accumulated unrealized loss recognized in other comprehensive income net of income taxes | $ 23,313,000 | $ 89,040,000
Zero cost collar contracts | Second quarter 2011 |  |
Copper derivative activity related to copper sales transactions |  |
Pounds (in millions) | 105,800,000 | 105,800,000
Average LME cap price | 4.84 | 4.84
Average LME floor price | 3.02 | 3.02
Zero cost collar contracts | Six months 2011 |  |
Copper derivative activity related to copper sales transactions |  |
Pounds (in millions) | 211,600,000 | 211,600,000
Average LME cap price | 4.84 | 4.84
Average LME floor price | 3.02 | 3.02
Zero cost collar contracts | Second half of 2011 |  |
Copper derivative activity related to copper sales transactions |  |
Pounds (in millions) | 211,600,000 | 211,600,000
Average LME cap price | 4.84 | 4.84
Average LME floor price | 3.02 | 3.02
Estimated percentage of copper sales covered (as a percent) |  | 30.00%
Accumulated unrealized loss recognized in other comprehensive income net of income taxes |  | 8,500,000
Accumulated unrealized loss recognized in other comprehensive income, income tax |  | 5,400,000
Zero cost collar contracts | 1st Quarter 2012 |  |
Copper derivative activity related to copper sales transactions |  |
Pounds (in millions) | 46,300,000 | 46,300,000
Average LME cap price | 5.18 | 5.18
Average LME floor price | 3.50 | 3.50
Estimated percentage of copper sales covered (as a percent) |  | 13.00%
Swap contracts | Second quarter 2011 |  |
Copper derivative activity related to copper sales transactions |  |
Pounds (in millions) | 112,400,000 | 112,400,000
Weighted average COMEX price | 4.08 | 4.08
Swap contracts | Six months 2011 |  |
Copper derivative activity related to copper sales transactions |  |
Pounds (in millions) | 232,000,000 | 232,000,000
Weighted average COMEX price | 4.08 | 4.08
Swap contracts | Second half of 2011 |  |
Copper derivative activity related to copper sales transactions |  |
Pounds (in millions) | 224,900,000 | 224,900,000
Weighted average COMEX price | 4.08 | 4.08
Estimated percentage of copper sales covered (as a percent) |  | 32.00%
Accumulated unrealized loss recognized in other comprehensive income net of income taxes |  | 28,000,000
Accumulated unrealized loss recognized in other comprehensive income, income tax |  | 17,600,000
Second quarter 2011 |  |
Copper derivative activity related to copper sales transactions |  |
Realized (loss) gain on copper derivatives | 8,600,000 |
Six months 2011 |  |
Copper derivative activity related to copper sales transactions |  |
Realized (loss) gain on copper derivatives |  | $ 44,300,000

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- Definition The average cap rate on a group of price risk derivatives such as caps or collars. A payment or receipt is triggered if the market rate exceeds the cap rate on the contract. + Details
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