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Decommissioning and Other Asset Retirement Obligations (Tables)
 12 Months Ended
Dec. 31, 2017
Asset Retirement Obligation [Abstract]  
Decommissioning and Other Asset Retirement Obligations Table
 
 
Year Ended December 31,
 
 
2017
 
2016
 
 
(In Thousands)
Beginning balance for the period, as reported
 
$
55,478

 
$
57,449

Activity in the period:
 
 

 
 

Accretion of liability
 
2,051

 
2,249

Retirement obligations incurred
 
265

 
—

Revisions in estimated cash flows
 
1,180

 
(180
)
Settlement of retirement obligations
 
(572
)
 
(4,040
)
Ending balance
 
$
58,402

 
$
55,478