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Asset Retirement Obligations (Tables)
 9 Months Ended
Sep. 30, 2014
Asset Retirement Obligation [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 nine-month periods ended September 30, 2014 and 2013 (in thousands):
 
Nine Months Ended 
 September 30,
 
2014
 
2013
Carrying Amount at Beginning of Period
$
761,898

 
$
665,944

Liabilities Incurred
91,822

 
48,556

Liabilities Settled (1)
(44,805
)
 
(54,859
)
Accretion
33,833

 
26,421

Revisions
68,785

 
27,252

Foreign Currency Translations
(4,178
)
 
(5,898
)
Carrying Amount at End of Period
$
907,355

 
$
707,416

 
 
 
 
Current Portion
$
12,528

 
$
14,329

Noncurrent Portion
$
894,827

 
$
693,087

 
(1)
Includes settlements related to asset sales.