Fair Value Measurements (Tables)

9 Months Ended

Sep. 30, 2013

Fair Value Disclosures [Abstract]

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

The following tables summarize the valuation of the Company’s financial assets and liabilities that were accounted for at fair value on a recurring basis in accordance with the classifications provided above as of September 30, 2013 and December 31, 2012 (in thousands).

	Fair Value Measurements at September 30, 2013 using
Description	Level 1		Level 2			Level 3		Total
Assets (Liabilities)
Certificates of deposit	$	—	$	40		$	—	$	40
Oil, natural gas and NGL derivatives	—		2,032			—		2,032
Oil, natural gas and NGL derivatives	—		(4,178		)	—		(4,178		)
Total	$	—	$	(2,106	)	$	—	$	(2,106	)

	Fair Value Measurements at December 31, 2012 using
Description	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

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

The following tables summarize the valuation of the Company’s assets and liabilities that were accounted for at fair value on a non-recurring basis for the periods ended September 30, 2013 and December 31, 2012 (in thousands).

	Fair Value Measurements at September 30, 2013 using
Description	Level 1		Level 2		Level 3			Total
Assets (Liabilities)
Asset retirement obligations	$	—	$	—	$	(951	)	$	(951	)
Total	$	—	$	—	$	(951	)	$	(951	)

	Fair Value Measurements at December 31, 2012 using
Description	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	)