Derivatives (Tables)

12 Months Ended

Dec. 31, 2012

Risk management derivatives

Schedule of activity for all derivative financial instruments

 For all derivative financial instruments we had the following activity for the years ended December 31, 2012 and 2011 (in thousands):

	Total
Derivative financial instruments asset at January 1, 2011	$	—
Total mark-to-market gains		2,275
Derivative financial instruments asset at December 31, 2011		2,275
Total mark-to-market gains		22,754
Realized gains upon settlement		(11,244	)
Derivative financial instruments asset at December 31, 2012	$	13,785

International Coal Forward Contracts

Risk management derivatives

Schedule of derivative financial instruments held for risk management purposes

	2012
			Weighted-Average Per Barrel
	Notional Amount
Settlement Period			Floor		Ceiling		Asset		Liability
	(barrels)
January 2013 to March 2013		129	$	66.24	$	105.47	$	13	$	—
April 2013 to June 2013		126		70.30		110.43		34		—
July 2013 to September 2013		126		70.00		110.00		91		—
Total		381	$	68.83	$	108.61	$	138	$	—

WTI Collars

Risk management derivatives

Schedule of derivative financial instruments held for risk management purposes

We held derivative financial instruments for risk management purposes as follows at December 31 (in thousands except per barrel amounts):

	2012							2011
Year of Settlement	Notional Amount		Asset		Liability			Notional Amount		Asset		Liability
	(tons)							(tons)
2012		—	$	—	$	—			215	$	1,090	$	—
2013		516		9,288		—			322		1,185		—
2014		198		2,776		—			—		—		—
2015		212		1,598		—			—		—		—
2016		132		15		(30	)		—		—		—
Total		1,058	$	13,677	$	(30	)		537	$	2,275	$	—