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Asset Retirement Obligations (Tables)
 12 Months Ended
Dec. 31, 2018
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, 2018 and 2017 (in thousands):
 
2018
 
2017
 
 
 
 
Carrying Amount at Beginning of Period
$
946,848

 
$
912,926

Liabilities Incurred
79,057

 
54,764

Liabilities Settled (1)
(70,829
)
 
(61,871
)
Accretion
36,622

 
34,708

Revisions
(38,932
)
 
(9,818
)
Foreign Currency Translations
1,611

 
16,139

Carrying Amount at End of Period
$
954,377

 
$
946,848

 
 
 
 
Current Portion
$
26,214

 
$
19,259

Noncurrent Portion
$
928,163

 
$
927,589

 

(1)
Includes settlements related to asset sales.