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Inventories Inventories (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Inventory Disclosure [Abstract]    
Raw material and subassemblies $ 232,674 $ 225,573
Work-in-progress 55,377 55,886
Finished goods 62,740 54,592
Total inventories $ 350,791 $ 336,051