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Asset Retirement Obligations (Tables)
 9 Months Ended
Sep. 30, 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 nine-month periods ended September 30, 2018 and 2017 (in thousands):
 
Nine Months Ended 
 September 30,
 
2018
 
2017
Carrying Amount at January 1
$
946,848

 
$
912,926

Liabilities Incurred
63,443

 
30,114

Liabilities Settled (1)
(15,319
)
 
(53,638
)
Accretion
27,306

 
25,963

Revisions
(39,137
)
 
(1,791
)
Foreign Currency Translations
(2,197
)
 
16,902

Carrying Amount at September 30
$
980,944

 
$
930,476

 
 
 
 
Current Portion
$
18,209

 
$
23,606

Noncurrent Portion
$
962,735

 
$
906,870

 
(1)
Includes settlements related to asset sales.