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Inventories
 9 Months Ended
Sep. 30, 2018
Inventory Disclosure [Abstract]  
Inventories Inventories
 
Inventories valued at LIFO cost represented 60% and 62% of total inventory at September 30, 2018 and December 31, 2017, respectively.  The excess of current cost over LIFO valued inventories was approximately $7,919,000 at September 30, 2018 and December 31, 2017. An actual valuation of inventory under the LIFO method is made only at the end of each year based on the inventory levels and costs at that time.  Accordingly, interim LIFO must be based, to some extent, on management's estimates at each quarter end. Net inventories consist of the following:

 
(in thousands)
September 30, 2018December 31, 2017
Finished goods
$154,555 $133,161 
Work in process
14,345 10,243 
Raw materials
15,118 12,164 
Total inventory
$184,018 $155,568 
 
Inventory obsolescence reserves were $7,106,000 at September 30, 2018 and $6,932,000 at December 31, 2017.