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Inventories (Details) (USD $) In Thousands, unless otherwise specified | Sep. 29, 2012 | Dec. 31, 2011
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Schedule of Inventory [Line Items] |  |
Raw materials and parts | $ 75,616 | $ 69,576
Work-in-process | 20,529 | 15,204
Finished goods | 50,617 | 39,261
Inventory, Gross, Total | 146,762 | 124,041
LIFO reserve | 259 | 259
Inventories, net | $ 147,021 | $ 124,300

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