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Asset Retirement Obligations (Tables)
 6 Months Ended
Jun. 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 six-month periods ended June 30, 2018 and 2017 (in thousands):
 
Six Months Ended 
 June 30,
 
2018
 
2017
Carrying Amount at January 1
$
946,848

 
$
912,926

Liabilities Incurred
25,496

 
19,276

Liabilities Settled (1)
(8,184
)
 
(28,726
)
Accretion
17,941

 
17,010

Revisions
(148
)
 
3,646

Foreign Currency Translations
(547
)
 
3,808

Carrying Amount at June 30
$
981,406

 
$
927,940

 
 
 
 
Current Portion
$
18,892

 
$
33,922

Noncurrent Portion
$
962,514

 
$
894,018

 
(1)
Includes settlements related to asset sales.