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Fair Value Measurements on a Recurring Basis (Tables)
 12 Months Ended
Dec. 31, 2014
Fair Value Disclosures [Abstract]  
Fair value, assets measured on recurring and nonrecurring basis
The following presents the fair value hierarchy for assets and liabilities measured at fair value on a recurring basis:
 
December 31, 2014
 
Level 2
 
Netting (1)
 
Total
 
(in thousands)
Assets:
 
 
 
 
 
Commodity derivatives
$
60,843

 
$
(17,149
)
 
$
43,694

Liabilities:
 
 
 
 
 
Commodity derivatives
$
17,149

 
$
(17,149
)
 
$
—


 
December 31, 2013
 
Level 2
 
Netting (1)
 
Total
 
(in thousands)
Assets:
 
 
 
 
 
Commodity derivatives
$
28,291

 
$
(20,184
)
 
$
8,107

Liabilities:
 
 
 
 
 
Commodity derivatives
$
45,226

 
$
(20,184
)
 
$
25,042

(1) 
Represents counterparty netting under agreements governing such derivatives.