Fair Value Measurements (Tables)

6 Months Ended

Jun. 30, 2012

Fair Value Measurements [Abstract]

Summary of the valuation of the Company's financial assets and liabilities that were accounted for at fair value on a recurring basis

Description	Fair Value Measurements at June 30, 2012 using
	Level 1		Level 2			Level 3		Total
Assets (Liabilities)
Certificates of deposit	$	—	$	266		$	—	$	266
Oil and natural gas derivatives		—		21,126			—		21,126
Total	$	—	$	21,392		$	—	$	21,392
Description	Fair Value Measurements at December 31, 2011 using
	Level 1		Level 2			Level 3		Total
Assets (Liabilities)
Certificates of deposit	$	—	$	1,335		$	—	$	1,335
Oil and natural gas derivatives		—		9,836			—		9,836
Oil and natural gas derivatives		—		(554	)		—		(554	)
Total	$	—	$	10,617		$	—	$	10,617

Additions to asset retirement obligations and lease and well equipment inventory at fair value on a non-recurring basis

Description	Fair Value Measurements for the period ended June 30, 2012 using
	Level 1		Level 2		Level 3			Total
Assets (Liabilities)
Asset retirement obligations	$	—	$	—	$	(326	)	$	(326	)
Total	$	—	$	—	$	(326	)	$	(326	)
Description	Fair Value Measurements for the period ended December 31, 2011 using
	Level 1		Level 2		Level 3			Total
Assets (Liabilities)
Asset retirement obligations	$	—	$	—	$	(187	)	$	(187	)
Lease and well equipment inventory		—		—		1,343			1,343
Total	$	—	$	—	$	1,156		$	1,156