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Inventories Inventories (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Inventory Disclosure [Abstract]    
Raw material and subassemblies $ 193,537 $ 204,542
Work-in-progress 56,620 45,060
Finished goods 99,935 95,117
Total inventories $ 350,092 $ 344,719