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Financial Instruments and Fair Value Measurements (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012		Dec. 31, 2011
Derivatives designated as hedging instruments, Cash Flow Hedges:
Notional Amount of Cash Flow Hedge Instruments	$ 50,250	[1]	$ 55,000	[1]
Derivatives designated as hedging instruments, Fair Value Hedge:
Notional Amount Of Derivatives Designated As Hedging Instruments	97,875	[1]	106,500	[1]
Derivatives not designated as hedging instruments:
Notional Amount of Derivatives	115,407	[1]	132,394	[1]
Forward Contracts [Member]
Derivatives designated as hedging instruments, Cash Flow Hedges:
Notional Amount of Cash Flow Hedge Instruments	50,250	[1]	55,000	[1]
Derivatives not designated as hedging instruments:
Notional amount of derivatives not designated as hedging instruments	17,532	[1]	25,894	[1]
Commodity Contract [Member]
Derivatives designated as hedging instruments, Cash Flow Hedges:
Notional Amount of Cash Flow Hedge Instruments	2,625	[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 Asset, Fair Value, Asset	4,270		1,080
Derivatives designated as hedging instruments, Fair Value Hedge:
Interest Rate Fair Value Hedge Derivative at Fair Value, Net	2,528		1,078
Fair Value Of Derivatives Designated As Hedging Instruments	4,270		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 Hedges:
Cash Flow Hedges Derivative Instruments at Fair Value, Net	1,709		0
Other Assets [Member] | Commodity Contract [Member]
Derivatives designated as hedging instruments, Cash Flow Hedges:
Cash Flow Hedges Derivative Instruments at Fair Value, Net	33		0
Other Liabilities [Member]
Derivatives designated as hedging instruments, Fair Value Hedge:
Derivative Liability, Fair Value, Liability	27		7,722
Interest Rate Fair Value Hedge Derivative at Fair Value, Net	0		0
Fair Value Of Derivatives Designated As Hedging Instruments	0		7,722
Other Liabilities [Member] | Forward Contracts [Member]
Derivatives not designated as hedging instruments:
Other Derivatives Not Designated as Hedging Instruments at Fair Value, Net	27		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
[1] Notional amounts represent the gross contract / notional amount of the derivatives outstanding.

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

+ References

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

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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.

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-Publisher FASB

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-Number 107

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Fair value of derivative asset, presented on a gross basis even when the derivative instrument is subject to master netting arrangements and qualifies for net presentation in the statement of financial position.

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

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