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Fixed Assets | 9 Months Ended
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Sep. 30, 2013
Fixed Assets And Asset Retirement Obligations [Abstract] |
Fixed Assets And Asset Retirement Obligations | 4. Fixed Assets Fixed Assets Fixed assets consisted of the following:
| September 30, 2013 |  | December 31, 2012
Pipelines and related assets | $ | 268,650 |  |  | $ | 226,831 |
Machinery and equipment | 110,710 |  |  | 87,502 |
Transportation equipment | 19,751 |  |  | 21,170 |
Marine vessels | 529,891 |  |  | 298,054 |
Land, buildings and improvements | 20,002 |  |  | 15,606 |
Office equipment, furniture and fixtures | 5,436 |  |  | 4,964 |
Construction in progress | 180,892 |  |  | 52,541 |
Other | 20,645 |  |  | 16,557 |
Fixed assets, at cost | 1,155,977 |  |  | 723,225 |
Less: Accumulated depreciation | (186,640 | ) |  | (157,944 | )
Net fixed assets | $ | 969,337 |  |  | $ | 565,281 |
Our depreciation expense for the periods presented was as follows:
| Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2013 |  | 2012 |  | 2013 |  | 2012
Depreciation expense | $ | 11,365 |  |  | $ | 9,202 |  |  | $ | 32,930 |  |  | $ | 27,246 |

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