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Inventories (Components Of Inventories) (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Inventory Disclosure [Abstract]    
Raw materials $ 49,393 $ 49,624
Work in process 8,483 2,969
Finished goods and parts 76,060 80,568
Inventories $ 133,936 $ 133,161