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Organization and Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2016
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: 
 
 
 
2015
 
2016
 
 
(in thousands)
Beginning asset retirement obligation
 
 
$
9,495

 
$
9,679

New wells placed on production and other
 
 
307

 
119

Deletions related to property disposals and plugging costs
 
 
(793
)
 
(1,832
)
Accretion expense
 
 
565

 
491

Revisions
 
 
105

 
166

Ending asset retirement obligation
 
 
$
9,679

 
$
8,623