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Organization and Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2014
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Asset Retirement Obligations
The following table summarizes the Company’s asset retirement obligations during the two years ended December 31: 
 
 
 
2013
 
2014
 
 
(in thousands)
Beginning asset retirement obligation
 
 
$
11,381

 
$
9,888

New wells placed on production and other
 
 
183

 
444

Deletions related to property disposals and plugging costs
 
 
(2,491
)
 
(1,318
)
Accretion expense
 
 
615

 
559

Revisions
 
 
151

 
198

Discontinued operations
 
 
49

 
(276
)
Ending asset retirement obligation
 
 
$
9,888

 
$
9,495