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Decommissioning and Other Asset Retirement Obligations (Tables)
 12 Months Ended
Dec. 31, 2015
Decommissioning and Other Asset Retirement Obligations (Tables)  
Decommissioning and Other Asset Retirement Obligations Table
 
 
Year Ended December 31,
 
 
2015
 
2014
 
 
(In Thousands)
Beginning balance for the period, as reported
 
$
62,741

 
$
50,904

Activity in the period:
 
 

 
 

Accretion of liability
 
2,000

 
728

Retirement obligations incurred
 
—

 
39,187

Revisions in estimated cash flows
 
3,341

 
35,241

Settlement of retirement obligations
 
(10,633
)
 
(63,319
)
Ending balance
 
$
57,449

 
$
62,741