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Asset Retirement Obligations (Tables)
 9 Months Ended
Sep. 30, 2015
Asset Retirement Obligation Disclosure [Abstract]  
Activity Related to Asset Retirement Obligations
Activity related to the Company’s asset retirement obligations is as follows:
(In thousands)
 
Nine Months Ended 
 September 30, 2015
Balance at beginning of period
 
$
126,655

Liabilities incurred
 
9,230

Liabilities settled
 
(83
)
Accretion expense
 
5,087

Balance at end of period
 
$
140,889