Derivatives Instruments and Hedging Activities (Details) (USD $) | Sep. 30, 2011 | Dec. 31, 2010 |
|---|---|---|
Commodity Swap Forward Contracts | Designated as Hedging Instrument | Other current assets | ||
| Derivatives, Fair Value | ||
| Total asset derivatives | $ 3,402,000 | $ 3,675,000 |
Commodity Swap Forward Contracts | Designated as Hedging Instrument | Other assets | ||
| Derivatives, Fair Value | ||
| Total asset derivatives | 291,000 | 1,463,000 |
Commodity Swap Forward Contracts | Designated as Hedging Instrument | Other accrued liabilities | ||
| Derivatives, Fair Value | ||
| Total liability derivatives | 32,000 | |
Commodity Swap Forward Contracts | Designated as Hedging Instrument | Noncurrent liabilities | ||
| Derivatives, Fair Value | ||
| Total liability derivatives | 65,000 | 32,000 |
Designated as Hedging Instrument | Foreign currency contracts | Other current assets | ||
| Derivatives, Fair Value | ||
| Total asset derivatives | 17,173,000 | 731,000 |
Designated as Hedging Instrument | Foreign currency contracts | Other accrued liabilities | ||
| Derivatives, Fair Value | ||
| Total liability derivatives | 8,636,000 | 2,527,000 |
Designated as Hedging Instrument | Total asset derivatives | ||
| Derivatives, Fair Value | ||
| Total asset derivatives | 20,866,000 | 5,869,000 |
Designated as Hedging Instrument | Liability Derivatives | ||
| Derivatives, Fair Value | ||
| Total liability derivatives | 8,701,000 | 2,591,000 |
Commodity Swap Forward Contracts | ||
| Derivatives, Fair Value | ||
| Total gross notional amount | 19,000,000 | |
| Maximum maturity period for derivative contract (in years) | August 2014 | |
Foreign currency contracts | ||
| Derivatives, Fair Value | ||
| Total gross notional amount | $ 580,000,000 | |
| Maximum maturity period for derivative contract (in years) | March 2012 |