XML 48 R33.htm IDEA: XBRL DOCUMENT v3.6.0.2
Asset Retirement Obligations (Tables)
 12 Months Ended
Dec. 31, 2016
Asset Retirement Obligation Disclosure [Abstract]  
Asset Retirement Obligations
Activity related to the Company's asset retirement obligations is as follows:
(In thousands)
 
Year Ended 
 December 31, 2016
Balance at beginning of period
 
$
145,606

Liabilities incurred
 
3,522

Liabilities settled
 
(1,148
)
Liabilities divested
 
(24,338
)
Accretion expense
 
8,065

Change in estimate
 
2,026

Balance at end of period
 
$
133,733