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Property, Plant and Equipment (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended |  |  | 3 Months Ended | 12 Months Ended |  | 12 Months Ended |  | 12 Months Ended |  | 12 Months Ended |  | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2011 Y | Dec. 31, 2010 | Dec. 31, 2011 Mexico ham boning and processing plant Y | Oct. 01, 2011 Mexico ham boning and processing plant Pork | Dec. 31, 2011 Land and improvements Y | Dec. 31, 2010 Land and improvements | Dec. 31, 2011 Buildings and improvements Y | Dec. 31, 2010 Buildings and improvements | Dec. 31, 2011 Machinery and equipment Y | Dec. 31, 2010 Machinery and equipment | Dec. 31, 2011 Vessels and vehicles Y | Dec. 31, 2010 Vessels and vehicles | Dec. 31, 2011 Office furniture and fixtures Y | Dec. 31, 2010 Office furniture and fixtures | Dec. 31, 2011 Construction in progress | Dec. 31, 2010 Construction in progress
Property, plant and equipment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Useful lives, minimum (in years) | 3 |  |  |  | 0 |  |  |  | 3 |  | 3 |  |  |  |  |
Useful Lives, maximum (in years) | 30 |  |  |  | 15 |  |  |  | 20 |  | 18 |  |  |  |  |
Useful Lives (in years) |  |  |  |  |  |  | 30 |  |  |  |  |  | 5 |  |  |
Gross property, plant and equipment | $ 1,656,508 | $ 1,496,312 |  |  | $ 173,517 | $ 166,201 | $ 376,659 | $ 348,160 | $ 794,435 | $ 727,148 | $ 147,125 | $ 144,380 | $ 28,376 | $ 26,527 | $ 136,396 | $ 83,896
Accumulated depreciation and amortization | (859,686) | (795,181) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net property, plant and equipment | 796,822 | 701,131 | 3,840 |  |  |  |  |  |  |  |  |  |  |  |  |
Period of plant operation (in years) |  |  | 2 |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment charge | 5,600 |  |  | 5,600 |  |  |  |  |  |  |  |  |  |  |  |
Impairment charge offset by reduction to noncontrolling interest |  |  | 1,830 |  |  |  |  |  |  |  |  |  |  |  |  |
Total impact on net earnings attributable to Seaboard, net of taxes |  |  | $ 2,300 |  |  |  |  |  |  |  |  |  |  |  |  |

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