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Fixed Assets and Asset Retirement Obligations (Tables) | 12 Months Ended
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Dec. 31, 2017
Fixed Assets And Asset Retirement Obligations [Abstract] |
Schedule of Fixed Assets | Fixed assets consisted of the following:
| December 31,
| 2017 |  | 2016
Crude oil pipelines and natural gas pipelines and related assets | $ | 3,028,657 |  |  | $ | 2,901,202 |
Alkali facilities, machinery, and equipment | 497,601 |  |  | — |
Onshore facilities, machinery, and equipment | 692,364 |  |  | 427,658 |
Transportation equipment | 21,483 |  |  | 17,543 |
Marine vessels | 918,953 |  |  | 863,199 |
Land, buildings and improvements | 223,186 |  |  | 55,712 |
Office equipment, furniture and fixtures | 18,112 |  |  | 9,654 |
Construction in progress | 151,768 |  |  | 440,225 |
Other | 48,891 |  |  | 48,203 |
Fixed assets, at cost | 5,601,015 |  |  | 4,763,396 |
Less: Accumulated depreciation | (734,986 | ) |  | (548,532 | )
Net fixed assets | $ | 4,866,029 |  |  | $ | 4,214,864 |
Schedule of Mineral Leaseholds | Mineral Leaseholds Our Mineral Leaseholds, as relating to our recently acquired Alkali Business, consist of the following:
| December 31, 2017
Mineral leaseholds | 566,019 |
Less: Accumulated depletion | (1,513 | )
Mineral leaseholds, net | $ | 564,506 |
Schedule of Change in Asset Retirement Obligation | A reconciliation of our liability for asset retirement obligations is as follows:
December 31, 2015 | $ | 188,662 |
AROs arising from the acquisition and consolidation of a previously held equity method investment | 20,940 |
Accretion expense | 10,800 |
Revisions in timing and estimated costs of AROs | (2,254 | )
Settlements | (4,422 | )
December 31, 2016 | 213,726 |
Accretion expense | 11,008 |
Revisions in timing and estimated costs of AROs | 7,146 |
Acquisitions | 131 |
Divestitures | (7,649 | )
Settlements | (26,415 | )
Other | 240 |
December 31, 2017 | $ | 198,187 |
Schedule of Asset Retirement Obligations | With respect to our AROs, the following table presents our forecast of accretion expense for the periods indicated:
2018 | $ | 10,799 |
2019 | $ | 9,760 |
2020 | $ | 9,429 |
2021 | $ | 10,069 |
2022 | $ | 10,753 |

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- Definition Tabular disclosure of physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, balances by class of assets, depreciation and depletion expense and method used, including composite depreciation, and accumulated deprecation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(13)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Tabular disclosure of the changes in carrying amount of a liability for asset retirement obligations, for changes such as new obligations, changes in estimates of existing obligations, spending on existing obligations, property dispositions, and foreign currency translation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 30 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6393242&loc=d3e13201-110859 + Details
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