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Asset Retirement Obligations (Tables)
 6 Months Ended
Jun. 30, 2013
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 six-month periods ended June 30, 2013 and 2012 (in thousands):

 
 
Six Months Ended
 
 
 
June 30,
 
 
 
2013
  
2012
 
 
 
  
 
Carrying Amount at Beginning of Period
 
$
665,944
  
$
587,084
 
Liabilities Incurred
  
24,660
   
29,799
 
Liabilities Settled (1)
  
(31,155
)
  
(47,920
)
Accretion
  
17,865
   
15,316
 
Revisions
  
67
   
52
 
Foreign Currency Translations
  
(11,192
)
  
(871
)
Carrying Amount at End of Period
 
$
666,189
  
$
583,460
 
 
        
Current Portion
 
$
16,949
  
$
28,496
 
Noncurrent Portion
 
$
649,240
  
$
554,964
 

(1)Includes settlements related to asset sales.