Derivative Instruments (Tables)

9 Months Ended

Sep. 30, 2013

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Commodity Derivative Positions

The following table sets forth our commodity derivative positions as of September 30, 2013:

		Average
		Volume Per	Weighted Average Price				Fair Value
	Instrument	Day	Floor/Swap		Ceiling		Asset		Liability
Crude Oil:		(barrels)	($/barrel)
Fourth quarter 2013	Collars	2,400	$	91.04	$	100.02	$	—	$	707
First quarter 2014	Collars	1,500	$	93.33	102.80		112		154
Second quarter 2014	Collars	1,500	$	93.33	102.80		287		67
Fourth quarter 2013	Swaps	7,000	$	95.94			224		3,806
First quarter 2014	Swaps	7,500	$	93.86			292		3,580
Second quarter 2014	Swaps	7,500	$	93.86			767		2,363
Third quarter 2014	Swaps	8,000	$	93.18			1,041		1,841
Fourth quarter 2014	Swaps	8,000	$	93.18			1,434		1,052
First quarter 2015	Swaps	2,000	$	92.03			192		231
Second quarter 2015	Swaps	2,000	$	92.03			518		376
Third quarter 2015	Swaps	1,000	$	91.25			319		236
Fourth quarter 2015	Swaps	1,000	$	91.25			395		254
First quarter 2014	Swaption	812	$	100.00			—		111
Second quarter 2014	Swaption	812	$	100.00			—		111
Third quarter 2014	Swaption	812	$	100.00			—		112
Fourth quarter 2014	Swaption	812	$	100.00			—		112
Natural Gas:		(in MMBtu)	($/MMBtu)
Fourth quarter 2013	Collars	15,000	$	3.67	$	4.37	242		—
First quarter 2014	Collars	5,000	$	4.00	$	4.50	131		—
Fourth quarter 2013	Swaps	10,000	$	4.04			411		—
First quarter 2014	Swaps	10,000	$	4.28			407		—
Second quarter 2014	Swaps	15,000	$	4.10			433		—
Third quarter 2014	Swaps	15,000	$	4.10			344		—
Fourth quarter 2014	Swaps	5,000	$	4.50			240		—
First quarter 2015	Swaps	5,000	$	4.50			151		—
Settlements to be paid in subsequent period							—		2,608

Impact of Derivative Activities on Condensed Consolidated Statements of Income

The impact of our derivatives activities on income is included in the Derivatives caption on our Condensed Consolidated Statements of Operations. The following table summarizes the effects of our derivative activities for the periods presented:

	Three Months Ended						Nine Months Ended
	September 30,						September 30,
	2013			2012			2013			2012
Impact by contract type:
Commodity contracts	$	(24,035	)	$	(12,271	)	$	(23,208	)	$	29,844
Interest rate contracts	—			—			—			1,406
	$	(24,035	)	$	(12,271	)	$	(23,208	)	$	31,250
Cash settlements and gains (losses):
Cash received for:
Commodity contract settlements	$	(4,165	)	$	9,238		$	1,625		$	22,783
Interest rate contract settlements	—			—			—			1,406
	(4,165		)	9,238			1,625			24,189
Gains (losses) attributable to:
Commodity contracts	(19,870		)	(21,509		)	(24,833		)	7,061
Interest rate contracts	—			—			—			—
	(19,870		)	(21,509		)	(24,833		)	7,061
	$	(24,035	)	$	(12,271	)	$	(23,208	)	$	31,250

Fair Value of Derivative Instruments on Condensed Consolidated Balance Sheets

The following table summarizes the fair values of our derivative instruments as well as the locations of these instruments, on our Condensed Consolidated Balance Sheets as of the dates presented:

		Fair Values as of
		September 30, 2013				December 31, 2012
		Derivative		Derivative		Derivative		Derivative
Type	Balance Sheet Location	Assets		Liabilities		Assets		Liabilities
Commodity contracts	Derivative assets/liabilities - current	$	4,424	$	15,305	$	11,292	$	—
Interest rate contracts	Derivative assets/liabilities - current	—		—		—		—
		4,424		15,305		11,292		—
Commodity contracts	Derivative assets/liabilities - noncurrent	1,900		799		5,181		1,421
Interest rate contracts	Derivative assets/liabilities - noncurrent	—		—		—		—
		1,900		799		5,181		1,421
		$	6,324	$	16,104	$	16,473	$	1,421