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Asset Retirement Obligations (Tables)
 6 Months Ended
Jun. 30, 2018
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, 2018
Balance at beginning of period(1)
 
$
48,553

Liabilities incurred
 
2,322

Liabilities settled
 
(789
)
Liabilities divested
 
(3,782
)
Accretion expense
 
1,223

Balance at end of period(2)
 
$
47,527

_______________________________________________________________________________
(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 June 30, 2018.