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Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2018
Accounting Policies [Abstract] |
Property, Plant and Equipment | Depreciation is computed using the straight-line method over management’s estimated useful lives of the related assets, except for automotive equipment, which is depreciated using a declining-balance method. The estimated useful lives are as follows:
| Years
Buildings and building improvements | 15-40
Pipelines, tanks and terminals | 15-40
Asset retirement obligation assets | 15-50
Other equipment | 3-15
Property, plant and equipment, at cost, consist of the following (in thousands):
|  | December 31,
|  | 2018 |  | 2017
Land |  | $ | 4,458 |  |  | $ | 4,440 |
Building and building improvements |  | 3,695 |  |  | 2,804 |
Pipelines, tanks and terminals |  | 410,154 |  |  | 314,251 |
Asset retirement obligation assets |  | 2,073 |  |  | 2,073 |
Other equipment |  | 15,838 |  |  | 14,650 |
Construction in process |  | 16,528 |  |  | 28,961 |
|  | 452,746 |  |  | 367,179 |
Less: accumulated depreciation |  | (140,184 | ) |  | (112,111 | )
|  | $ | 312,562 |  |  | $ | 255,068 |
Property, plant and equipment, accumulated depreciation and depreciation expense by reporting segment as of and for the years ended December 31, 2018 and 2017 are as follows (in thousands):
|  | As of and For the Year Ended December 31, 2018
|  | Pipelines and Transportation |  | Wholesale Marketing and Terminalling |  | Consolidated
Property, plant and equipment |  | $ | 361,702 |  |  | $ | 91,044 |  |  | $ | 452,746 |
Less: accumulated depreciation |  | (106,971 | ) |  | (33,213 | ) |  | (140,184 | )
Property, plant and equipment, net |  | $ | 254,731 |  |  | $ | 57,831 |  |  | $ | 312,562 |
Depreciation expense |  | $ | 21,115 |  |  | $ | 4,786 |  |  | $ | 25,901 |
|  | As of and For the Year Ended December 31, 2017
|  | Pipelines and Transportation |  | Wholesale Marketing and Terminalling |  | Consolidated
Property, plant and equipment |  | $ | 300,134 |  |  | $ | 67,045 |  |  | $ | 367,179 |
Less: Accumulated depreciation |  | (84,435 | ) |  | (27,676 | ) |  | (112,111 | )
Property, plant and equipment, net |  | $ | 215,699 |  |  | $ | 39,369 |  |  | $ | 255,068 |
Depreciation expense |  | $ | 17,268 |  |  | $ | 3,583 |  |  | $ | 20,851 |
Schedule of Change in Asset Retirement Obligation | The reconciliation of the beginning and ending carrying amounts of asset retirement obligations as of December 31, 2018 and 2017 is as follows (in thousands):
|  | December 31,
|  | 2018 |  | 2017
Beginning balance |  | $ | 4,064 |  |  | $ | 3,772 |
Liabilities acquired |  | 768 |  |  | — |
Accretion expense |  | 359 |  |  | 292 |
Ending balance |  | $ | 5,191 |  |  | $ | 4,064 |

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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://fasb.org/us-gaap/role/ref/legacyRef -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 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -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 + 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://fasb.org/us-gaap/role/ref/legacyRef -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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