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Asset Retirement Obligations (Tables)
 12 Months Ended
Dec. 31, 2018
Asset Retirement Obligation [Abstract]  
Decommissioning and Other Asset Retirement Obligations Table
 
 
Year Ended December 31,
 
 
2018
 
2017
 
 
(In Thousands)
Beginning balance for the period, as reported
 
$
11,738

 
$
9,912

Activity in the period:
 
 

 
 

Accretion of liability
 
563

 
624

Retirement obligations incurred
 
59

 
265

Revisions in estimated cash flows
 
(123
)
 
1,349

Settlement of retirement obligations
 
(35
)
 
(412
)
Ending balance
 
$
12,202

 
$
11,738