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Fixed Assets | 6 Months Ended
--- | ---
Jun. 30, 2014
Fixed Assets And Asset Retirement Obligations [Abstract] |
Fixed Assets And Asset Retirement Obligations | 5. Fixed Assets Fixed Assets Fixed assets consisted of the following:
| June 30, 2014 |  | December 31, 2013
Pipelines and related assets | $ | 421,319 |  |  | $ | 338,920 |
Machinery and equipment | 260,457 |  |  | 173,092 |
Transportation equipment | 18,535 |  |  | 19,140 |
Marine vessels | 585,933 |  |  | 554,679 |
Land, buildings and improvements | 31,912 |  |  | 30,170 |
Office equipment, furniture and fixtures | 5,537 |  |  | 5,633 |
Construction in progress | 195,712 |  |  | 183,037 |
Other | 32,705 |  |  | 23,303 |
Fixed assets, at cost | 1,552,110 |  |  | 1,327,974 |
Less: Accumulated depreciation | (227,838 | ) |  | (199,230 | )
Net fixed assets | $ | 1,324,272 |  |  | $ | 1,128,744 |
Our depreciation expense for the periods presented was as follows:
| Three Months Ended June 30, |  | Six Months Ended June 30,
| 2014 |  | 2013 |  | 2014 |  | 2013
Depreciation expense | $ | 16,409 |  |  | $ | 11,067 |  |  | $ | 31,686 |  |  | $ | 21,558 |

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