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Asset Retirement Obligations (Tables)
 3 Months Ended
Mar. 31, 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 three-month periods ended March 31, 2017 and 2016 (in thousands):
 
Three Months Ended 
 March 31,
 
2017
 
2016
Carrying Amount at Beginning of Period
$
912,926

 
$
811,554

Liabilities Incurred
7,418

 
9,289

Liabilities Settled (1)
(11,197
)
 
(3,143
)
Accretion
8,525

 
8,202

Revisions
3,646

 
(252
)
Foreign Currency Translations
837

 
(1,390
)
Carrying Amount at End of Period
$
922,155

 
$
824,260

 
 
 
 
Current Portion
$
19,450

 
$
7,963

Noncurrent Portion
$
902,705

 
$
816,297

 
(1)
Includes settlements related to asset sales.