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Decommissioning and Other Asset Retirement Obligations (Tables)
 12 Months Ended
Dec. 31, 2016
Decommissioning and Other Asset Retirement Obligations (Tables)  
Decommissioning and Other Asset Retirement Obligations Table
 
 
Year Ended December 31,
 
 
2016
 
2015
 
 
(In Thousands)
Beginning balance for the period, as reported
 
$
57,449

 
$
62,741

Activity in the period:
 
 

 
 

Accretion of liability
 
2,249

 
2,000

Retirement obligations incurred
 
—

 
—

Revisions in estimated cash flows
 
(180
)
 
3,341

Settlement of retirement obligations
 
(4,040
)
 
(10,633
)
Ending balance
 
$
55,478

 
$
57,449