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Asset Retirement Obligations (Tables)
 6 Months Ended
Jun. 30, 2019
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, 2019 and 2018 (in thousands):
 
Six Months Ended 
 June 30,
 
2019
 
2018
Carrying Amount at January 1
$
954,377

 
$
946,848

Liabilities Incurred
56,490

 
25,496

Liabilities Settled (1)
(41,650
)
 
(8,184
)
Accretion
20,523

 
17,941

Revisions
8,006

 
(148
)
Foreign Currency Translations
219

 
(547
)
Carrying Amount at June 30
$
997,965

 
$
981,406

 
 
 
 
Current Portion
$
27,416

 
$
18,892

Noncurrent Portion
$
970,549

 
$
962,514

 
(1)
Includes settlements related to asset sales.