Derivative Instruments (Tables)

9 Months Ended

Sep. 30, 2013

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:

	Derivative Assets
	Balance Sheet Location	Fair Value as of
		September 30, 2013		December 31, 2012
Designated as hedging instruments
Commodity forward contracts	Accounts receivable, net	$	3,208	$	13,032
Not designated as hedging instruments
Commodity forward contracts	Accounts receivable, net	2,541		1,395
Total derivative assets		$	5,749	$	14,427

	Derivative Liabilities
	Balance Sheet Location	Fair Value as of
		September 30, 2013		December 31, 2012
Designated as hedging instruments
Commodity forward contracts	Accrued liabilities	$	—	$	399
Not designated as hedging instruments
Commodity forward contracts	Accrued liabilities	2,090		13,295
Total derivative liabilities		$	2,090	$	13,694

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, 2013 and 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,
		2013			2012			2013			2012
Commodity forward contracts	Cost of sales	$	(232	)	$	(515	)	$	(342	)	$	12,345
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,
		2013			2012			2013			2012
Firm commitment designated    as the hedged item	Cost of sales	$	236		$	515		$	15		$	(13,546	)

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,
		2013		2012		2013		2012
Commodity forward contracts	Cost of sales	$	4,854	$	249	$	9,897	$	(783	)