Derivative Commodity Instruments (Tables)

12 Months Ended

Dec. 31, 2011

Derivative Commodity Instruments [Abstract]

Fair Values Of Derivative Instruments In Consolidated Balance Sheets

	Asset Derivatives
	Balance Sheet Location	Fair Value as of December 31,
		2011		2010
Not designated as hedging instruments
Commodity forward contracts	Accounts receivable, net	$	2,437	$	47
Total asset derivatives		$	2,437	$	47
	Liability Derivatives
	Balance Sheet Location	Fair Value as of December 31,
		2011		2010
Designated as hedging instruments
Commodity forward contracts	Accrued liabilities	$	3,262	$	—
Not designated as hedging instruments
Commodity forward contracts	Accrued liabilities		973		46
Total liability derivatives		$	4,235	$	46

Impact Of Derivative Instruments Designated As Fair Value Hedges

Derivatives in Fair Value Hedging Relationships	Location of Gain (Loss) Recognized in Income on Derivative	Year Ended December 31,
		2011			2010		2009
Commodity forward contracts	Cost of sales	$	(4,895	)	$	—	$	—
Hedged Items in Fair Value Hedging Relationships	Location of Gain (Loss) Recognized in Income on Hedged Items	Year Ended December 31,
		2011			2010		2009
Firm commitment designated as the hedged item	Cost of sales	$	5,092		$	—	$	—

Impact Of Derivative Instruments Not Designated As Fair Value Hedges

Derivatives Not Designated as Hedging Instruments	Location of Gain (Loss) Recognized in Income on Derivative	Year Ended December 31,
		2011		2010		2009
Commodity forward contracts	Cost of sales	$	2,043	$	69	$	5,347