Derivative Instruments (Tables)

9 Months Ended

Sep. 30, 2012

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Fair Values of Derivatives Instruments in Consolidated Balance Sheets

The fair values of derivative instruments in the Company’s consolidated balance sheets were as follows:

	Asset Derivatives
	Balance Sheet Location	Fair Value as of
		September 30, 2012		December 31, 2011
Designated as hedging instruments
Commodity forward contracts	Accounts receivable, net	$	8,630	$	—
Not designated as hedging instruments
Commodity forward contracts	Accounts receivable, net	1,213		2,437
Total asset derivatives		$	9,843	$	2,437

	Liability Derivatives
	Balance Sheet Location	Fair Value as of
		September 30, 2012		December 31, 2011
Designated as hedging instruments
Commodity forward contracts	Accrued liabilities	$	1,019	$	3,262
Not designated as hedging instruments
Commodity forward contracts	Accrued liabilities	1,873		973
Total liability derivatives		$	2,892	$	4,235

Impact of Derivatives Instruments Designated as Fair Value Hedges

The following tables reflect the impact of derivative instruments designated as fair value hedges and the related hedged item on the Company’s consolidated statements of operations. For the three and nine months ended September 30, 2012, there was no material ineffectiveness with regard to the Company’s qualifying fair value hedges.

Derivatives in Fair Value    Hedging Relationships	Location of Gain (Loss) Recognized in  Income on Derivative	Three Months Ended September 30,						Nine Months Ended September 30,
		2012			2011			2012			2011
Commodity forward contracts	Cost of sales	$	(515	)	$	(1,780	)	$	12,345		$	(1,780	)
Hedged Items in Fair Value    Hedging Relationships	Location of Gain (Loss) Recognized in  Income on Hedged Items	Three Months Ended September 30,						Nine Months Ended September 30,
		2012			2011			2012			2011
Firm commitment designated as the    hedged item	Cost of sales	$	515		$	1,780		$	(13,546	)	$	1,780

Impact of Derivative Instruments Designated as Cash Flow Hedges

The following table reflects the impact of derivative instruments designated as cash flow hedges on the Company’s consolidated statements of operations for the three and nine months ended September 30, 2012.

Derivatives in Cash Flow    Hedging Relationships	Location of Gain (Loss) Reclassified from Accumulated Other Comprehensive Income into Income	Three Months Ended September 30,					Nine Months Ended September 30,
		2012			2011		2012			2011
Treasury lock agreements	Interest expense	$	(813	)	$	—	$	(813	)	$	—

Impact of Derivative Instruments Not Designated as Fair Value Hedges

The impact of derivative instruments that have not been designated as hedges on the Company’s consolidated statements of operations were as follows:

Derivatives Not Designated as    Hedging Instruments	Location of Gain (Loss) Recognized in  Income on Derivative	Three Months Ended September 30,				Nine Months Ended September 30,
		2012		2011		2012			2011
Commodity forward contracts	Cost of sales	$	249	$	371	$	(783	)	$	838