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Decommissioning and Other Asset Retirement Obligations (Tables)
 6 Months Ended
Jun. 30, 2017
Asset Retirement Obligation Disclosure [Abstract]  
Decommissioning and Other Asset Retirement Obligations Table
 
Three Months Ended June 30, 2017
 
Six Months Ended June 30, 2017
 
(In Thousands)
Beginning balance for the period, as reported
$
55,482

 
$
55,478

Activity in the period:
 
 
 
Accretion of liability
551

 
1,031

Retirement obligations incurred
—

 
—

Revisions in estimated cash flows
(2
)
 
(14
)
Settlement of retirement obligations
(32
)
 
(496
)
Ending balance
$
55,999

 
$
55,999