Subsequent Events (Tables)

12 Months Ended

Dec. 31, 2012

Subsequent Event [Line Items]

Summary of contracts for oil and natural gas

Commodity	Calculation Period		Notional Quantity (Bbl/month)		Price Floor ($/Bbl)		Price Ceiling ($/Bbl)		Fair Value of Asset (thousands)
Oil		01/01/2013 - 03/31/2013		20,000		90.00		110.00	$	122
Oil		01/01/2013 - 12/31/2013		20,000		85.00		102.25		96
Oil		01/01/2013 - 12/31/2013		20,000		90.00		115.00		980
Oil		01/01/2013 - 12/31/2013		20,000		85.00		110.40		471
Oil		01/01/2013 - 12/31/2013		20,000		85.00		108.80		418
Oil		01/01/2013 - 06/30/2014		8,000		90.00		114.00		666
Oil		01/01/2013 - 06/30/2014		12,000		90.00		115.50		1,036
Total open oil costless collar contracts										3,789
Commodity	Calculation Period		Notional Quantity (MMBtu/month)		Price Floor ($/MMBtu)		Price Ceiling ($/MMBtu)		Fair Value of Asset (Liability) (thousands)
Natural Gas		01/01/2013 - 07/31/2013		150,000		4.50		5.75		1,154
Natural Gas		01/01/2013 - 12/31/2013		100,000		3.00		3.83		(146	)
Natural Gas		01/01/2013 - 12/31/2013		100,000		3.00		4.95		40
Natural Gas		01/01/2013 - 12/31/2013		100,000		3.00		4.96		41
Natural Gas		01/01/2014 - 12/31/2014		100,000		3.25		5.37		19
Natural Gas		01/01/2014 - 12/31/2014		100,000		3.25		5.42		27
Total open natural gas costless collar contracts										1,135

Commodity	Calculation Period		Notional Quantity (Bbl/month)		Fixed Price ($/Bbl)		Fair Value of  Liability (thousands)
Oil		01/01/2013 - 12/31/2013		10,000		90.20		(362	)
Oil		01/01/2013 - 12/31/2013		10,000		90.65		(308	)
Total open oil swap contracts								(670	)

Commodity	Calculation Period		Notional Quantity (Gal/month)		Fixed Price ($/Gal)		Fair Value of  Asset (Liability) (thousands)
Purity Ethane		01/01/2013 - 12/31/2013		110,000		0.335		106
Purity Ethane		01/01/2013 - 12/31/2013		110,000		0.355		133
Propane		01/01/2013 - 12/31/2013		53,000		0.953		13
Propane		01/01/2013 - 12/31/2013		53,000		1.001		43
Normal Butane		01/01/2013 - 12/31/2013		14,700		1.455		(29	)
Normal Butane		01/01/2013 - 12/31/2013		14,700		1.560		(10	)
Isobutane		01/01/2013 - 12/31/2013		7,000		1.515		(18	)
Isobutane		01/01/2013 - 12/31/2013		7,000		1.625		(9	)
Natural Gasoline		01/01/2013 - 12/31/2013		12,000		2.025		(8	)
Natural Gasoline		01/01/2013 - 12/31/2013		12,000		2.085		1
Natural Gasoline		01/01/2013 - 12/31/2013		12,000		2.102		3
Total open NGL swap contracts							$	225
Total open derivative financial instruments							$	4,479

Schedule of future minimum lease payments required under the office lease agreement

Year ending December 31,	Amount
2013	$	575
2014		575
2015		589
2016		604
2017		618
Thereafter		2,995
Total	$	5,956

Subsequent Event [Member]

Subsequent Event [Line Items]

Summary of contracts for oil and natural gas

Commodity	Calculation Period		Notional Quantity (Bbls/month)		Price Floor ($/Bbl)		Price Ceiling ($/Bbl)
Oil		07/01/2013 - 12/31/2013		20,000		90.00		102.80
Oil		01/01/2014 - 12/31/2014		15,000		85.00		97.50
Oil		01/01/2014 - 12/31/2014		30,000		85.00		98.00
Oil		01/01/2014 - 12/31/2014		15,000		87.00		97.00
Oil		01/01/2014 - 12/31/2014		20,000		90.00		97.00
Oil		01/01/2014 - 12/31/2014		15,000		90.00		97.90
Oil		01/01/2014 - 12/31/2014		15,000		90.00		98.00

Commodity	Calculation Period		Notional Quantity (MMBtu/month)		Price Floor ($/MMBtu)		Price Ceiling ($/MMBtu)
Natural Gas		04/01/2013 - 12/31/2013		100,000		3.25		4.41
Natural Gas		04/01/2013 - 12/31/2013		100,000		3.25		4.44
Natural Gas		04/01/2013 - 12/31/2013		100,000		3.50		4.37
Natural Gas		07/01/2013 - 12/31/2013		150,000		3.00		4.24
Natural Gas		01/01/2014 - 12/31/2014		100,000		3.00		5.15
Natural Gas		01/01/2014 - 12/31/2014		100,000		3.25		5.21
Natural Gas		01/01/2014 - 12/31/2014		100,000		3.25		5.22
Natural Gas		01/01/2014 - 12/31/2014		100,000		3.50		4.90

Commodity	Calculation Period		Notional Quantity (Gal/month)		Fixed Price ($/Gal)
Normal Butane		03/01/2013 - 12/31/2013		21,000		1.575
Normal Butane		03/01/2013 - 12/31/2013		117,000		1.575
Normal Butane		01/01/2014 - 12/31/2014		17,500		1.540
Normal Butane		01/01/2014 - 12/31/2014		45,500		1.550
Isobutane		03/01/2013 - 12/31/2013		43,500		1.675
Isobutane		03/01/2013 - 12/31/2013		23,000		1.675
Isobutane		01/01/2014 - 12/31/2014		22,000		1.640
Isobutane		01/01/2014 - 12/31/2014		37,000		1.640
Natural Gasoline		03/01/2013 - 12/31/2013		36,000		2.105
Natural Gasoline		03/01/2013 - 12/31/2013		90,500		2.148
Natural Gasoline		01/01/2014 - 12/31/2014		30,000		1.970
Natural Gasoline		01/01/2014 - 12/31/2014		41,000		2.000

Schedule of future minimum lease payments required under the office lease agreement

Year ending December 31,	Amount
2013	$	643
2014		734
2015		752
2016		771
2017		789
Thereafter		3,813
Total	$	7,502