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Asset Retirement Obligations (Tables)
 9 Months Ended
Sep. 30, 2014
Asset Retirement Obligation Disclosure [Abstract]  
Schedule of changes in asset retirement obligations
The following table reflects the changes in ARO during the nine months ended September 30, 2014 and the year ended December 31, 2013:

 
September 30,
2014
 
December 31,
2013
 
(In thousands)
Beginning of period
$
49,981

 
$
51,477

Additional ARO from new properties
692

 
795

Sales or abandonments of properties
(4,375
)
 
(5,892
)
Accretion expense
2,723

 
4,203

Revisions of previous estimates
(3,798
)
 
(602
)
End of period
$
45,223

 
$
49,981