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Fixed Assets And Asset Retirement Obligations | 12 Months Ended
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Dec. 31, 2011
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:
|  |  | 0000000 |  |  |  | 0000000 |
|  | December 31, |
|  | 2011 |  |  | 2010 |
Land, buildings and improvements |  | $ | 13,140 |  |  | $ | 14,335 |
Pipelines and related assets |  |  | 167,865 |  |  |  | 156,805 |
Machinery and equipment |  |  | 46,233 |  |  |  | 29,433 |
Transportation equipment |  |  | 21,732 |  |  |  | 29,249 |
Marine vessels |  |  | 262,216 |  |  |  | 122,992 |
Office equipment, furniture and fixtures |  |  | 3,778 |  |  |  | 3,742 |
Construction in progress |  |  | 14,236 |  |  |  | 4,493 |
Other |  |  | 11,938 |  |  |  | 12,290 |
Subtotal |  |  | 541,138 |  |  |  | 373,339 |
Accumulated depreciation |  |  | (124,213 | ) |  |  | (108,283 | )
Total |  | $ | 416,925 |  |  | $ | 265,056 |
Depreciation expense was $27.3 million, $22.5 million and $25.2 million for the years ended December 31, 2011, 2010, and 2009, respectively. Asset Retirement Obligations A reconciliation of our liability for asset retirement obligations is as follows:
Asset retirement obligations as of December 31, 2009 |  | $ | 4,838 |
Accretion expense |  |  | 341 |
Asset retirement obligations as of December 31, 2010 |  |  | 5,179 |
Liabilities incurred and assumed in the current period |  |  | 349 |
Accretion expense |  |  | 372 |
Asset retirement obligations as of December 31, 2011 |  | $ | 5,900 |

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