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Inventories (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Major classes of inventories    
Finished goods $ 206,711 $ 167,577
Service parts 126,291 132,508
Raw materials and work in process 84,687 76,377
Total inventories $ 417,689 $ 376,462