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Fixed Assets and Asset Retirement Obligations | 12 Months Ended
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Dec. 31, 2014
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,
| 2014 |  | 2013
Pipelines and related assets | $ | 466,613 |  |  | $ | 338,920 |
Machinery and equipment | 376,672 |  |  | 173,092 |
Transportation equipment | 18,479 |  |  | 19,140 |
Marine vessels | 731,016 |  |  | 554,679 |
Land, buildings and improvements | 38,037 |  |  | 30,170 |
Office equipment, furniture and fixtures | 6,696 |  |  | 5,633 |
Construction in progress | 222,233 |  |  | 183,037 |
Other | 39,312 |  |  | 23,303 |
Fixed assets, at cost | 1,899,058 |  |  | 1,327,974 |
Less: Accumulated depreciation | (268,057 | ) |  | (199,230 | )
Net fixed assets | $ | 1,631,001 |  |  | $ | 1,128,744 |
Depreciation expense was $73.2 million, $46.3 million and $37.4 million for the years ended December 31, 2014, 2013, and 2012, respectively. Asset Retirement Obligations A reconciliation of our liability for asset retirement obligations is as follows:
December 31, 2012 | $ | 12,695 |
Liabilities incurred | 789 |
Accretion expense | 848 |
December 31, 2013 | 14,332 |
Liabilities incurred | — |
Accretion expense | 458 |
December 31, 2014 | $ | 14,790 |

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