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Inventories (Components Of Inventories) (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Inventory Disclosure [Abstract]    
Raw materials $ 42,066 $ 49,624
Work in process 5,496 2,969
Finished goods and parts 63,544 80,568
Inventories 111,106 133,161
Inventory reserve $ 12,812 $ 10,310