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Inventories
 6 Months Ended
Jun. 30, 2019
Inventory Disclosure [Abstract]  
Inventories Inventories
 
Inventories valued at LIFO cost represented 54% and 60% of total inventory at June 30, 2019 and December 31, 2018, respectively. The excess of current cost over LIFO valued inventories was approximately $10,646,000 at June 30, 2019 and December 31, 2018. 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)
June 30, 2019December 31, 2018
Finished goods
$172,577 $149,298 
Work in process
18,192 12,732 
Raw materials
15,141 14,600 
Inventories, net$205,910 $176,630 
 
Inventory obsolescence reserves were $7,014,000 at June 30, 2019 and $7,194,000 at December 31, 2018.