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Asset Retirement Obligations
 12 Months Ended
Dec. 31, 2019
Asset Retirement Obligation Disclosure [Abstract]  
Asset Retirement Obligations Asset Retirement Obligations
Activity related to the Company's asset retirement obligations is as follows:
 
 
Year Ended December 31,
(In thousands)
 
2019
 
2018
Balance at beginning of period
 
$
51,622

 
$
48,553

Liabilities incurred
 
7,646

 
5,152

Liabilities settled
 
(1,280
)
 
(1,035
)
Liabilities divested
 
(187
)
 
(3,809
)
Accretion expense
 
3,430

 
2,541

Change in estimate
 
10,867

 
220

Balance at end of period
 
72,098

 
51,622

Less: current asset retirement obligation
 
(500
)
 
(1,000
)
Noncurrent asset retirement obligation
 
$
71,598

 
$
50,622