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Inventories (Components Of Inventories) (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Inventory Disclosure [Abstract]    
Raw materials $ 42,673 $ 37,660
Work in process 4,247 3,906
Finished goods and parts 67,573 62,337
Inventories $ 114,493 $ 103,903