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Inventories (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Major classes of inventories    
Finished goods $ 215,580 $ 183,286
Service parts 146,786 151,189
Raw materials and work in process 98,777 78,521
Total inventories $ 461,143 $ 412,996