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Decommissioning and Other Asset Retirement Obligations (Tables)
 12 Months Ended
Dec. 31, 2012
Decommissioning and Other Asset Retirement Obligations (Tables)  
Decommissioning and Other Asset Retirement Obligations Table
 
 
Year Ended December 31,
 
2012
 
2011
 
(In Thousands)
 
 
 
 
 
 
 
 
Beginning balance for the period, as reported
$
139,835
 
 
$
272,815
 
 
 
 
 
 
 
 
 
Activity in the period:
 
 
 
 
 
 
 
Accretion of liability
 
1,536
 
 
 
4,325
 
Retirement obligations incurred
 
-
 
 
 
-
 
Revisions in estimated cash flows
 
40,986
 
 
 
79,360
 
Settlement of retirement obligations
 
(87,436)
 
 
 
(216,665)
 
Ending balance
$
94,921
 
 
$
139,835