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Fixed Assets | 3 Months Ended
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Mar. 31, 2015
Fixed Assets And Asset Retirement Obligations [Abstract] |
Fixed Assets And Asset Retirement Obligations | 5. Fixed Assets Fixed Assets Fixed assets consisted of the following:
| March 31, 2015 |  | December 31, 2014
Pipelines and related assets | $ | 473,854 |  |  | $ | 466,613 |
Machinery and equipment | 382,046 |  |  | 376,672 |
Transportation equipment | 17,983 |  |  | 18,479 |
Marine vessels | 736,638 |  |  | 731,016 |
Land, buildings and improvements | 38,244 |  |  | 38,037 |
Office equipment, furniture and fixtures | 6,866 |  |  | 6,696 |
Construction in progress | 318,890 |  |  | 222,233 |
Other | 42,718 |  |  | 39,312 |
Fixed assets, at cost | 2,017,239 |  |  | 1,899,058 |
Less: Accumulated depreciation | (287,077 | ) |  | (268,057 | )
Net fixed assets | $ | 1,730,162 |  |  | $ | 1,631,001 |
Our depreciation expense for the periods presented was as follows:
| Three Months Ended March 31,
| 2015 |  | 2014
Depreciation expense | $ | 22,037 |  |  | $ | 15,277 |

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