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Inventories, Net
 9 Months Ended
Sep. 30, 2018
Inventories, Net  
Inventories, Net

7.    Inventories, Net

 

Inventories are valued principally at the lower of cost, determined using the average cost method, or market.  Costs for raw materials and finished goods include materials, labor, and production overhead.  Inventories, net consisted of the following (in thousands):

 

 

 

 

 

 

 

 

 

 

 

September 30,

 

December 31,

 

 

 

2018

 

2017

 

Lime and limestone inventories:

    

 

    

    

 

    

 

Raw materials

 

$

4,458

 

$

5,105

 

Finished goods

 

 

2,426

 

 

2,266

 

 

 

 

6,884

 

 

7,371

 

Service parts inventories

 

 

6,019

 

 

6,175

 

 

 

$

12,903

 

$

13,546