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Asset Retirement Obligations (Tables)
 9 Months Ended
Sep. 30, 2019
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, 2019
Balance at beginning of period(1)
 
$
51,622

Liabilities incurred
 
4,776

Liabilities settled
 
(1,232
)
Liabilities divested
 
(187
)
Accretion expense
 
2,489

Balance at end of period(2)
 
$
57,468

_______________________________________________________________________________
(1)
Includes $1.0 million of current asset retirement obligations included in accrued liabilities at December 31, 2018.
(2)
Includes $0.5 million of current asset retirement obligations included in accrued liabilities at September 30, 2019.