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Inventories Inventories (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
Inventory Disclosure [Abstract]    
Raw material and subassemblies $ 231,736 $ 225,573
Work-in-progress 56,153 55,886
Finished goods 72,878 54,592
Total inventories $ 360,767 $ 336,051