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Asset Retirement Obligation (Tables)
 6 Months Ended
Jun. 30, 2015
Asset Retirement Obligation [Abstract]  
Schedule of changes in asset retirement obligations
The following table reflects the changes in the ARO during the six months ended June 30, 2015 and year ended December 31, 2014:
 
 
June 30,
2015
 
December 31,
2014
 
 
(In thousands)
Asset retirement obligation - beginning of period
 
$
226,525

 
$
175,786

Liabilities incurred with properties acquired
 
18,756

 
50,487

Liabilities incurred with properties drilled
 
—

 
941

Liabilities settled during the period
 
(1,271
)
 
(2,918
)
Liabilities associated with properties sold
 
(4,572
)
 
(5,891
)
Current period accretion
 
5,201

 
8,120

Asset retirement obligation - end of period
 
$
244,639

 
$
226,525