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Fixed Assets and Asset Retirement Obligations | 12 Months Ended
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Dec. 31, 2012
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,
| 2012 |  | 2011
Pipelines and related assets | $ | 226,831 |  |  | $ | 167,865 |
Machinery and equipment | 87,502 |  |  | 46,233 |
Transportation equipment | 21,170 |  |  | 21,732 |
Marine vessels | 298,054 |  |  | 262,216 |
Land, buildings and improvements | 15,606 |  |  | 13,140 |
Office equipment, furniture and fixtures | 4,964 |  |  | 3,778 |
Construction in progress | 52,541 |  |  | 14,236 |
Other | 16,557 |  |  | 11,938 |
Fixed assets, at cost | 723,225 |  |  | 541,138 |
Less: Accumulated depreciation | (157,944 | ) |  | (124,213 | )
Net fixed assets | $ | 565,281 |  |  | $ | 416,925 |
Depreciation expense was $37.4 million, $27.5 million and $22.5 million for the years ended December 31, 2012, 2011, and 2010, respectively. Asset Retirement Obligations A reconciliation of our liability for asset retirement obligations is as follows:
December 31, 2010 | $ | 5,179 |
Liabilities incurred and assumed in the current period | 349 |
Accretion expense | 372 |
December 31, 2011 | 5,900 |
Liabilities incurred and assumed in the current period | 5,995 |
Accretion expense | 800 |
December 31, 2012 | $ | 12,695 |

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