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Inventories (Details) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Inventory Disclosure [Abstract]    
Raw materials and parts $ 149,790 $ 148,372
Work in process 36,982 38,381
Finished goods 301,607 315,256
Gross inventories 488,379 502,009
Inventory reserve (72,274) (77,888)
Inventories $ 416,105 $ 424,121