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Asset Retirement Obligations (Tables)
 12 Months Ended
Dec. 31, 2013
Asset Retirement Obligation Disclosure [Abstract]  
Schedule Of Asset Retirement Obligations
The following table shows certain information about our AROs for the periods indicated:
 
 
2013
 
2012
 
 
(In thousands)
 
ARO liability, January 1:
$
146,159

 
$
96,446

 
Accretion of discount
5,450

 
4,615

 
Liability incurred
4,857

 
56,650

(1) 
Liability settled
(4,751
)
 
(2,788
)
 
Liability sold
(2,622
)
 
(1,258
)
 
Revision of estimates (2)
(15,436
)
 
(7,506
)
 
ARO liability, December 31:
133,657

 
146,159

 
Less current portion
2,954

 
2,953

 
Total long-term ARO liability
$
130,703

 
$
143,206

 
_________________________
(1)
The liability incurred increased $46.7 million related to the Noble properties acquired in September 2012.
(2)
Plugging liability estimates were revised in both 2013 and 2012 for updates in the cost of services used to plug wells over the preceding year. We had various upward and downward adjustments as well as changes in estimated timing of cash flows.