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Financial Instruments and Fair Value Measurements (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2012 | Dec. 31, 2011
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Forward Contracts [Member] |  |  |  |
Derivatives designated as hedging instruments, Cash Flow Hedges: |  |  |  |
Notional Amount of Cash Flow Hedge Instruments | $ 36,500 | [1] | $ 55,000 | [1]
Derivatives not designated as hedging instruments: |  |  |  |
Notional amount of derivatives not designated as hedging instruments | 12,643 | [1] | 25,894 | [1]
Commodity Contract [Member] |  |  |  |
Derivatives designated as hedging instruments, Cash Flow Hedges: |  |  |  |
Notional Amount of Cash Flow Hedge Instruments | 2,436 | [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] | 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 Hedges: |  |  |  |
Cash Flow Hedges Derivative Instruments at Fair Value, Net | 1,800 |  | 0 |
Other Assets [Member] | Commodity Contract [Member] |  |  |  |
Derivatives designated as hedging instruments, Cash Flow Hedges: |  |  |  |
Cash Flow Hedges Derivative Instruments at Fair Value, Net | 340 |  | 0 |
Other Assets [Member] | Interest Rate Swap [Member] |  |  |  |
Derivatives designated as hedging instruments, Fair Value Hedge: |  |  |  |
Interest Rate Fair Value Hedge Derivative at Fair Value, Net | 2,212 |  | 1,078 |
Other Liabilities [Member] | Forward Contracts [Member] |  |  |  |
Derivatives not designated as hedging instruments: |  |  |  |
Other Derivatives Not Designated as Hedging Instruments at Fair Value, Net | 191 |  | 0 |
Derivatives designated as hedging instruments, Cash Flow Hedges: |  |  |  |
Cash Flow Hedges Derivative Instruments at Fair Value, Net | 0 |  | 4,158 |
Other Liabilities [Member] | Commodity Contract [Member] |  |  |  |
Derivatives designated as hedging instruments, Cash Flow Hedges: |  |  |  |
Cash Flow Hedges Derivative Instruments at Fair Value, Net | 0 |  | 3,564 |
Other Liabilities [Member] | Interest Rate Swap [Member] |  |  |  |
Derivatives designated as hedging instruments, Fair Value Hedge: |  |  |  |
Interest Rate Fair Value Hedge Derivative at Fair Value, Net | $ 0 |  | $ 0 |
[1] | Notional amounts represent the gross contract / notional amount of the derivatives outstanding.

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- Definition Net fair value of all derivative instruments designated as cash flow hedging instruments, which is ordinarily reflected within other comprehensive income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 107 -Paragraph 10 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 + Details
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- Definition Fair value of all derivatives designated as interest rate fair value hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 17 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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