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Inventories (Components Of Inventories) (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Inventory Disclosure [Abstract]    
Raw materials $ 50,840 $ 49,624
Work in process 5,900 2,969
Finished goods and parts 81,179 80,568
Inventories $ 137,919 $ 133,161