Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 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 December 31, 2012 using
	Level 1		Level 2			Level 3		Total
Assets (Liabilities)
Certificates of deposit	$	–	$	230		$	–	$	230
Oil, natural gas and NGL derivatives		–		5,149			–		5,149
Oil, natural gas and NGL derivatives		–		(670	)		–		(670	)
Total	$	–	$	4,709		$	–	$	4,709
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 at December 31, 2012 using
	Level 1		Level 2		Level 3			Total
Assets (Liabilities)
Asset retirement obligations	$	–	$	–	$	(1,243	)	$	(1,243	)
Lease and well equipment inventory		–		–		34			34
Total	$	–	$	–	$	(1,209	)	$	(1,209	)

Description	Fair Value Measurements at 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