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Asset Retirement Obligations (Tables) | 12 Months Ended
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Dec. 31, 2019
Asset Retirement Obligations, Noncurrent [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 years ended December 31, 2019 and 2018 (in thousands):
| 2019 |  | 2018
Carrying Amount at Beginning of Period | $ | 954,377 |  |  | $ | 946,848 |
Liabilities Incurred | 98,874 |  |  | 79,057 |
Liabilities Settled (1) | (58,673 | ) |  | (70,829 | )
Accretion | 43,462 |  |  | 36,622 |
Revisions | 72,425 |  |  | (38,932 | )
Foreign Currency Translations | 245 |  |  | 1,611 |
Carrying Amount at End of Period | $ | 1,110,710 |  |  | $ | 954,377 |
Current Portion | $ | 37,127 |  |  | $ | 26,214 |
Noncurrent Portion | $ | 1,073,583 |  |  | $ | 928,163 |
(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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