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Asset Retirement Obligations (Tables) | 6 Months Ended
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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.

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- Definition Tabular disclosure of the carrying amount of a liability for asset retirement obligations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 + Details
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