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Asset Retirement Obligations (Tables)
 9 Months Ended
Sep. 30, 2017
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, 2017 and 2016 (in thousands):
 
Nine Months Ended 
 September 30,
 
2017
 
2016
Carrying Amount at Beginning of Period
$
912,926

 
$
811,554

Liabilities Incurred
30,114

 
40,080

Liabilities Settled (1)
(53,638
)
 
(52,518
)
Accretion
25,963

 
24,462

Revisions
(1,791
)
 
(26,307
)
Foreign Currency Translations
16,902

 
(7,851
)
Carrying Amount at End of Period
$
930,476

 
$
789,420

 
 
 
 
Current Portion
$
23,606

 
$
10,133

Noncurrent Portion
$
906,870

 
$
779,287

 
(1)
Includes settlements related to asset sales.