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Asset Retirement Obligations (Tables)
 12 Months Ended
Dec. 31, 2017
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, 2017 and 2016 (in thousands):
 
2017
 
2016
 
 
 
 
Carrying Amount at Beginning of Period
$
912,926

 
$
811,554

Liabilities Incurred (1)
54,764

 
212,739

Liabilities Settled (2)
(61,871
)
 
(94,800
)
Accretion
34,708

 
32,306

Revisions
(9,818
)
 
(38,286
)
Foreign Currency Translations
16,139

 
(10,587
)
Carrying Amount at End of Period
$
946,848

 
$
912,926

 
 
 
 
Current Portion
$
19,259

 
$
18,516

Noncurrent Portion
$
927,589

 
$
894,410

 
(1)
Includes $164 million in 2016 related to Yates transaction (see Note 17).
(2)
Includes settlements related to asset sales.