v2.4.0.6
Asset Retirement Obligations (Tables)
 12 Months Ended
Dec. 31, 2012
Asset Retirement Obligations [Abstract]  
Asset Retirement Obligation Rollforward Analysis
The following table presents the reconciliation of the beginning and ending aggregate carrying amounts of short-term and long-term legal obligations associated with the retirement of property, plant and equipment for the years ended December 31, 2012 and 2011 (in thousands):

 
 
2012
 
2011
 
 
 
 
 
Carrying Amount at Beginning of Period
$
587,084 
$
498,288 
 
Liabilities Incurred
 
107,378 
 
68,703 
 
Liabilities Settled (1)
 
(77,384)
 
(66,129)
 
Accretion
 
30,020 
 
27,907 
 
Revisions
 
15,287 
 
58,786 
 
Foreign Currency Translations
 
3,559 
 
(471)
Carrying Amount at End of Period
$
665,944 
$
587,084 
 
 
 
 
 
Current Portion
$
30,127 
$
29,527 
Noncurrent Portion
$
635,817 
$
557,557 

(1)    Includes settlements related to asset sales.