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Asset Retirement Obligations (Tables)
 3 Months Ended
Mar. 31, 2018
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, 2018 and 2017 (in thousands):
 
Three Months Ended 
 March 31,
 
2018
 
2017
Carrying Amount at January 1
$
946,848

 
$
912,926

Liabilities Incurred
10,279

 
7,418

Liabilities Settled (1)
50

 
(11,197
)
Accretion
8,868

 
8,525

Revisions
(291
)
 
3,646

Foreign Currency Translations
245

 
837

Carrying Amount at March 31
$
965,999

 
$
922,155

 
 
 
 
Current Portion
$
19,177

 
$
19,450

Noncurrent Portion
$
946,822

 
$
902,705

 
(1)
Includes settlements related to asset sales.