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Inventories (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Inventory Disclosure [Abstract]        
Raw materials and parts $ 139,573 $ 145,970    
Work in process 51,819 86,558    
Finished goods 276,076 243,726    
Gross inventories 467,468 476,254    
Inventory reserve (26,419) (21,125) (17,440) (10,106)
Inventories $ 441,049 $ 455,129