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Inventories (Components Of Inventories) (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Sep. 30, 2017
Inventory Disclosure [Abstract]      
Raw materials $ 50,533 $ 37,660  
Work in process 4,318 3,906  
Finished goods and parts 73,313 62,337  
Inventories $ 128,164 $ 103,903  
Inventory adjustments     $ 12,900