Derivatives (Tables)

3 Months Ended

Mar. 31, 2013

Risk management derivatives

Schedule of activity for all derivative financial instruments

For all derivative financial instruments, we had the following activity (in thousands):

	2013		2012
Derivative financial instruments net asset at January 1,	$	13,785	$	2,275
Total derivative mark-to-market gains (losses) for the three months ended March 31,	13,652		(2,056		)
Total derivative cash settlements paid (received) for the three months ended March 31,	24		(524		)
Derivative financial instruments net asset (liability) at March 31,	$	27,461	$	(305	)

International Coal Forward Contracts

Risk management derivatives

Schedule of derivative financial instruments

	March 31, 2013
Year of Settlement	Notional Amount	Gross Amounts of Recognized Assets		Gross Amounts Offset in the Consolidated Balance Sheet			Net Amounts Presented in the Consolidated Balance Sheet
	(tons)
2013	646	$	12,964	$	(848	)	$	12,116
2014	1,124	9,831		—			9,831
2015	344	4,268		—			4,268
2016	132	1,215		—			1,215
Total	2,246	$	28,278	$	(848	)	$	27,430

	December 31, 2012
Year of Settlement	Notional Amount	Gross Amounts of Recognized Assets		Gross Amounts Offset in the Consolidated Balance Sheet			Net Amounts Presented in the Consolidated Balance Sheet
2013	516	$	9,288	$	—		$	9,288
2014	198	2,776		—			2,776
2015	212	1,598		—			1,598
2016	132	15		(30		)	(15		)
Total	1,058	$	13,677	$	(30	)	$	13,647

WTI Collars

Risk management derivatives

Schedule of derivative financial instruments

	March 31, 2013
	Notional	Weighted-Average per barrel				Gross Amounts of Recognized		Gross Amounts Offset in the Consolidated			Net Amounts Presented in the Consolidated
Settlement Period	Amount	Floor		Ceiling		Assets		Balance Sheet			Balance Sheet
	(barrels)
April 2013 to June 2013	126	$	70.30	$	110.43	$	5	$	—		$	5
July 2013 to September 2013	126	70.00		110.00		41		—			41
October 2013 to December 2013	138	73.78		113.85		14		—			14
January 2014 to March 2014	144	73.00		115.10		—		(29		)	(29		)
Total	534	$	71.86	$	112.47	$	60	$	(29	)	$	31

	December 31, 2012
	Notional	Weighted-Average per barrel				Gross Amounts of Recognized		Gross Amounts Offset in the Consolidated		Net Amounts Presented in the Consolidated
Settlement Period	Amount	Floor		Ceiling		Assets		Balance Sheet		Balance Sheet
	(barrels)
January 2013 to March 2013	129	$	66.24	$	105.47	$	13	$	—	$	13
April 2013 to June 2013	126	70.30		110.43		34		—		34
July 2013 to September 2013	126	70.00		110.00		91		—		91
Total	381	$	68.83	$	108.61	$	138	$	—	$	138

Domestic Coal Futures Contracts

Risk management derivatives

Schedule of derivative financial instruments

	March 31, 2013
	Notional
Year of Settlement	Amount	Gain		Loss
	(tons)
2014	420	$	67	$	91
Total	420	$	67	$	91