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Inventories
12 Months Ended
Dec. 31, 2018
Inventory Disclosure [Abstract]  
INVENTORIES INVENTORIES
 
      Inventories valued at LIFO represented 60% and 62% of total inventory for the years ended December 31, 2018 and 2017, respectively. The excess of current costs (market value) over LIFO-valued inventories was $10,646,000 and $7,919,000 on December 31, 2018 and December 31, 2017, respectively. 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