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Fair Value Measurements (Tables)
 3 Months Ended
Mar. 31, 2015
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 March 31, 2015 and December 31, 2014 (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 March 31, 2015
$
—

 
$
11,175

 
$
—

At December 31, 2014
$
—

 
$
8,631

 
$
—