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Inventories (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
Inventories [Abstract]    
Raw materials and parts $ 148,830 $ 125,730
Work-in-process 85,117 71,490
Finished goods 79,412 80,157
Used equipment 27,623 21,688
Total $ 340,982 $ 299,065