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Financial Instruments and Fair Value Measurements (Details) (USD $) In Thousands, unless otherwise specified | Jun. 30, 2012 | Dec. 31, 2011
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Derivatives designated as hedging instruments, Cash Flow Hedge: |  |  |  |
Notional Amount of Cash Flow Hedge Instruments | $ 0 |  |  |
Derivatives designated as hedging instruments, Fair Value Hedge: |  |  |  |
Notional Amount Of Derivatives Designated As Hedging Instruments | 112,250 | [1] | 106,500 | [1]
Derivatives not designated as hedging instruments: |  |  |  |
Notional Amount of Derivatives | 137,494 | [1] | 132,394 | [1]
Forward Contracts [Member] |  |  |  |
Derivatives designated as hedging instruments, Cash Flow Hedge: |  |  |  |
Notional Amount of Cash Flow Hedge Instruments | 64,000 | [1] | 55,000 | [1]
Derivatives not designated as hedging instruments: |  |  |  |
Derivatives designated as hedging instruments, Cash Flow Hedge | 25,244 | [1] | 25,894 | [1]
Commodity Contract [Member] |  |  |  |
Derivatives designated as hedging instruments, Cash Flow Hedge: |  |  |  |
Notional Amount of Cash Flow Hedge Instruments | 3,250 | [1] | 6,500 | [1]
Interest Rate Swap [Member] |  |  |  |
Derivatives designated as hedging instruments, Fair Value Hedge: |  |  |  |
Notional Amount of Fair Value Hedge Instruments | 45,000 | [1] | 45,000 | [1]
Other Assets [Member] |  |  |  |
Derivatives not designated as hedging instruments: |  |  |  |
Derivative, Fair Value, Net | 1,832 |  | 1,080 |
Derivatives designated as hedging instruments, Fair Value Hedge: |  |  |  |
Interest Rate Fair Value Hedge Derivative at Fair Value, Net | 1,832 |  | 1,078 |
Fair Value Of Derivatives Designated As Hedging Instruments | 1,832 |  | 1,078 |
Other Assets [Member] | Forward Contracts [Member] |  |  |  |
Derivatives not designated as hedging instruments: |  |  |  |
Other Derivatives Not Designated as Hedging Instruments at Fair Value, Net | 0 |  | 2 |
Derivatives designated as hedging instruments, Cash Flow Hedge: |  |  |  |
Cash Flow Hedges Derivative Instruments at Fair Value, Net | 0 |  | 0 |
Other Assets [Member] | Commodity Contract [Member] |  |  |  |
Derivatives designated as hedging instruments, Cash Flow Hedge: |  |  |  |
Cash Flow Hedges Derivative Instruments at Fair Value, Net | 0 |  | 0 |
Other Liabilities [Member] |  |  |  |
Derivatives not designated as hedging instruments: |  |  |  |
Derivative, Fair Value, Net | 2,273 |  | 7,722 |
Derivatives designated as hedging instruments, Fair Value Hedge: |  |  |  |
Interest Rate Fair Value Hedge Derivative at Fair Value, Net | 0 |  | 0 |
Fair Value Of Derivatives Designated As Hedging Instruments | 2,237 |  | 7,222 |
Other Liabilities [Member] | Forward Contracts [Member] |  |  |  |
Derivatives not designated as hedging instruments: |  |  |  |
Other Derivatives Not Designated as Hedging Instruments at Fair Value, Net | 36 |  | 0 |
Derivatives designated as hedging instruments, Cash Flow Hedge: |  |  |  |
Cash Flow Hedges Derivative Instruments at Fair Value, Net | 607 |  | 4,158 |
Other Liabilities [Member] | Commodity Contract [Member] |  |  |  |
Derivatives designated as hedging instruments, Cash Flow Hedge: |  |  |  |
Cash Flow Hedges Derivative Instruments at Fair Value, Net | $ 1,630 |  | $ 3,564 |
[1] | Notional amounts represent the gross contract / notional amount of the derivatives outstanding.

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