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Asset Retirement Obligations (Tables)
 12 Months Ended
Dec. 31, 2016
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, 2016 and 2015 (in thousands):
 
2016
 
2015
 
 
 
 
Carrying Amount at Beginning of Period
$
811,554

 
$
752,718

Liabilities Incurred (1)
212,739

 
63,844

Liabilities Settled (2)
(94,800
)
 
(17,415
)
Accretion
32,306

 
31,956

Revisions
(38,286
)
 
(13,356
)
Foreign Currency Translations
(10,587
)
 
(6,193
)
Carrying Amount at End of Period
$
912,926

 
$
811,554

 
 
 
 
Current Portion
$
18,516

 
$
7,651

Noncurrent Portion
$
894,410

 
$
803,903

 
(1)
Includes $164 million related to Yates transaction (see Note 17).
(2)
Includes settlements related to asset sales.