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Asset Retirement Obligations (Tables)
 12 Months Ended
Dec. 31, 2018
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, 2018
Balance at beginning of period (1)
 
$
48,553

Liabilities incurred
 
5,152

Liabilities settled
 
(1,035
)
Liabilities divested
 
(3,809
)
Accretion expense
 
2,541

Transferred from held for sale
 
220

Balance at end of period (2)
 
$
51,622

_______________________________________________________________________________
(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 December 31, 2018.