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Financial Instruments and Fair Value Measurements (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012		Dec. 31, 2011
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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- Definition

Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Article 12

-Section 13

-Sentence Column B

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Aggregate fair value of all derivatives designated as a hedging instrument. The notional amount relates to a number of currency units, shares, bushels, pounds, or other units specified in a derivative instrument.

+ References

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Net fair value of all derivative instruments designated as cash flow hedging instruments, which is ordinarily reflected within other comprehensive income.

+ References

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-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.



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Fair value of the assets less the liabilities of a derivative or group of derivatives.

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Fair value of all derivatives designated as interest rate fair value hedging instruments.

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