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Inventories (Components Of Inventories) (Details) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2012 | Dec. 31, 2011
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Inventories [Abstract] |  |
Raw materials and component parts | $ 155,253 | $ 155,577
Work-in-process | 39,924 | 40,506
Finished goods | 58,387 | 58,175
Total | $ 253,564 | $ 254,258

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