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Asset Retirement Obligations (Tables)
 6 Months Ended
Jun. 30, 2016
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)
 
Six Months Ended 
 June 30, 2016
Balance at beginning of period
 
$
145,606

Liabilities incurred
 
2,389

Liabilities settled
 
(135
)
Liabilities divested
 
(16,353
)
Accretion expense
 
3,559

Balance at end of period
 
$
135,066