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Inventories (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Inventory Disclosure [Abstract]    
Raw material and subassemblies $ 204,542 $ 231,273
Work-in-progress 45,060 50,644
Finished goods 95,117 97,163
Total inventories $ 344,719 $ 379,080