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Inventories (Tables)
12 Months Ended
Dec. 31, 2018
Inventory Disclosure [Abstract]  
Schedule of Inventory, Current Inventories consisted of the following on a cost basis, net of reserves for obsolescence and LIFO:
  December 31, 
(in thousands) 20182017
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