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Asset Retirement Obligations
 9 Months Ended
Sep. 30, 2018
Asset Retirement Obligation Disclosure [Abstract]  
Asset Retirement Obligations
Asset Retirement Obligations
Activity related to the Company’s asset retirement obligations is as follows:
(In thousands)
 
Nine Months Ended 
 September 30, 2018
Balance at beginning of period(1)
 
$
48,553

Liabilities incurred
 
3,592

Liabilities settled
 
(1,025
)
Liabilities divested
 
(3,782
)
Accretion expense
 
1,867

Balance at end of period(2)
 
$
49,205

_______________________________________________________________________________
(1)
Includes $5.0 million of current asset retirement obligations included in accrued liabilities at December 31, 2017.
(2)
Includes $1.0 million of current asset retirement obligations included in accrued liabilities at September 30, 2018.