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Fair Value Measurements (Tables)
 6 Months Ended
Jun. 30, 2014
Fair Value Disclosures [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, 2014 and December 31, 2013 (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, 2014
$
—

 
$
(3,654
)
 
$
—

At December 31, 2013
$
—

 
$
(1,096
)
 
$
—