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Asset Retirement Obligations (Tables) | 3 Months Ended
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Mar. 31, 2020
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, 2020 and 2019 (in thousands):
| Three Months Ended March 31,
| 2020 |  | 2019
Carrying Amount at January 1 | $ | 1,110,710 |  |  | $ | 954,377 |
Liabilities Incurred | 15,573 |  |  | 15,360 |
Liabilities Settled (1) | (24,430 | ) |  | (24,709 | )
Accretion | 11,404 |  |  | 10,193 |
Revisions | (64 | ) |  | (9,704 | )
Foreign Currency Translations | (388 | ) |  | 112 |
Carrying Amount at March 31 | $ | 1,112,805 |  |  | $ | 945,629 |
Current Portion | $ | 37,641 |  |  | $ | 26,182 |
Noncurrent Portion | $ | 1,075,164 |  |  | $ | 919,447 |
(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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