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Asset Retirement Obligations (Tables)
 12 Months Ended
Dec. 31, 2015
Asset Retirement Obligations, Noncurrent [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, 2015 and 2014 (in thousands):
 
2015
 
2014
 
 
 
 
Carrying Amount at Beginning of Period
$
752,718

 
$
761,898

Liabilities Incurred
63,844

 
123,849

Liabilities Settled (1)
(17,415
)
 
(247,422
)
Accretion
31,956

 
41,489

Revisions
(13,356
)
 
82,885

Foreign Currency Translations
(6,193
)
 
(9,981
)
Carrying Amount at End of Period
$
811,554

 
$
752,718

 
 
 
 
Current Portion
$
7,651

 
$
11,814

Noncurrent Portion
$
803,903

 
$
740,904

 
(1)
Includes settlements related to asset sales.