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Inventories (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Inventory Disclosure [Abstract]        
Raw materials and parts $ 106,329 $ 148,372    
Work in process 23,303 38,381    
Finished goods 277,303 315,256    
Gross inventories 406,935 502,009    
Inventory reserve (68,352) (77,888) $ (29,456) $ (26,419)
Inventories $ 338,583 $ 424,121