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Fair Value Measurements (Details 2) (USD $) In Thousands, unless otherwise specified | Jun. 30, 2013 | Dec. 31, 2012
--- | --- | ---
Commodity contracts |  |
Derivative instruments, at their respective fair value positions |  |
Total Net Assets | $ 35,527 | $ 19,654
Total Net Liabilities | 15,647 | 16,140
Commodity contracts | Other current assets |  |
Derivative instruments, at their respective fair value positions |  |
Total Net Assets | 34,032 | 18,277
Commodity contracts | Identifiable intangible and other non-current assets |  |
Derivative instruments, at their respective fair value positions |  |
Total Net Assets | 1,495 | 1,377
Commodity contracts | Accrued expenses and other current liabilities |  |
Derivative instruments, at their respective fair value positions |  |
Total Net Liabilities | 14,778 | 15,152
Commodity contracts | Other long-term liabilities |  |
Derivative instruments, at their respective fair value positions |  |
Total Net Liabilities | 869 | 988
Foreign currency contracts |  |
Derivative instruments, at their respective fair value positions |  |
Total Net Assets | 3,541 | 145
Total Net Liabilities | 1,595 | 1,556
Foreign currency contracts | Other current assets |  |
Derivative instruments, at their respective fair value positions |  |
Total Net Assets | 3,486 | 145
Foreign currency contracts | Identifiable intangible and other non-current assets |  |
Derivative instruments, at their respective fair value positions |  |
Total Net Assets | 55 |
Foreign currency contracts | Accrued expenses and other current liabilities |  |
Derivative instruments, at their respective fair value positions |  |
Total Net Liabilities | 1,595 | 1,458
Foreign currency contracts | Other long-term liabilities |  |
Derivative instruments, at their respective fair value positions |  |
Total Net Liabilities |  | $ 98

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