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Asset Retirement Obligations (Tables)
 6 Months Ended
Jun. 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 six-month periods ended June 30, 2014 and 2013 (in thousands):
 
Six Months Ended June 30,
 
2014
 
2013
Carrying Amount at Beginning of Period
$
761,898

 
$
665,944

Liabilities Incurred
54,819

 
24,660

Liabilities Settled (1)
(25,478
)
 
(31,155
)
Accretion
23,346

 
17,865

Revisions
13,859

 
67

Foreign Currency Translations
2,506

 
(11,192
)
Carrying Amount at End of Period
$
830,950

 
$
666,189

 
 
 
 
Current Portion
$
28,498

 
$
16,949

Noncurrent Portion
$
802,452

 
$
649,240

 
(1)
Includes settlements related to asset sales.