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Asset Retirement Obligations (Tables)
 12 Months Ended
Dec. 31, 2014
Asset Retirement Obligation Disclosure [Abstract]  
Schedule of changes in asset retirement obligations
The following table reflects the changes in ARO for the years ended December 31, 2014 and December 31, 2013:
 
 
2014
 
2013
 
(In thousands)
Beginning of year
$
49,981

 
$
51,477

Additional ARO from new properties
1,209

 
795

Sales or abandonments of properties
(5,246
)
 
(5,892
)
Accretion expense
3,662

 
4,203

Revisions of previous estimates
(3,909
)
 
(602
)
End of year
$
45,697

 
$
49,981