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Inventories (Schedule of Inventory, Current) (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Inventory Disclosure [Abstract]    
Finished goods and parts $ 149,298 $ 133,161
Work in process 12,732 10,243
Raw materials 14,600 12,164
Inventory, net $ 176,630 $ 155,568