Fair Value Measurements (Tables)

6 Months Ended

Jun. 30, 2012

Fair Value Measurements [Abstract]

Net valuation of the Company's derivatives subject to fair value measurement on a recurring basis

The following table summarizes the net valuation of the Company’s derivatives subject to fair value measurement on a recurring basis as of June 30, 2012 and December 31, 2011 (in thousands):

	Fair Value Measurements Using
Instrument	Quoted Prices in Active Markets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Commodity Derivatives:
At June 30, 2012	$	—	$	4,439	$	—
At December 31, 2011	$	—	$	6,418	$	—