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Fixed Assets and Asset Retirement Obligations | 12 Months Ended
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Dec. 31, 2013
Fixed Assets And Asset Retirement Obligations [Abstract] |
Fixed Assets and Asset Retirement Obligations | 6. Fixed Assets and Asset Retirement Obligations Fixed Assets Fixed assets consisted of the following:
| December 31,
| 2013 |  | 2012
Pipelines and related assets | $ | 338,920 |  |  | $ | 226,831 |
Machinery and equipment | 173,092 |  |  | 87,502 |
Transportation equipment | 19,140 |  |  | 21,170 |
Marine vessels | 554,679 |  |  | 298,054 |
Land, buildings and improvements | 30,170 |  |  | 15,606 |
Office equipment, furniture and fixtures | 5,633 |  |  | 4,964 |
Construction in progress | 183,037 |  |  | 52,541 |
Other | 23,303 |  |  | 16,557 |
Fixed assets, at cost | 1,327,974 |  |  | 723,225 |
Less: Accumulated depreciation | (199,230 | ) |  | (157,944 | )
Net fixed assets | $ | 1,128,744 |  |  | $ | 565,281 |
Depreciation expense was $46.3 million, $37.4 million and $27.5 million for the years ended December 31, 2013, 2012, and 2011, respectively. Asset Retirement Obligations A reconciliation of our liability for asset retirement obligations is as follows:
December 31, 2011 | $ | 5,900 |
Liabilities incurred | 5,995 |
Accretion expense | 800 |
December 31, 2012 | 12,695 |
Liabilities incurred | 789 |
Accretion expense | 848 |
December 31, 2013 | $ | 14,332 |

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