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Asset Retirement Obligations (Tables)
 3 Months Ended
Mar. 31, 2016
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 three-month periods ended March 31, 2016 and 2015 (in thousands):
 
Three Months Ended 
 March 31,
 
2016
 
2015
Carrying Amount at Beginning of Period
$
811,554

 
$
752,718

Liabilities Incurred
9,289

 
11,281

Liabilities Settled (1)
(3,143
)
 
(6,816
)
Accretion
8,202

 
7,840

Revisions
(252
)
 
2,880

Foreign Currency Translations
(1,390
)
 
(4,949
)
Carrying Amount at End of Period
$
824,260

 
$
762,954

 
 
 
 
Current Portion
$
7,963

 
$
9,280

Noncurrent Portion
$
816,297

 
$
753,674

 
(1)
Includes settlements related to asset sales.