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Inventories, Net
 3 Months Ended
Mar. 31, 2020
Inventories, Net  
Inventories, Net

8.    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):

 

 

 

 

 

 

 

 

 

 

 

March 31,

 

December 31,

 

 

 

2020

 

2019

 

Lime and limestone inventories:

    

 

    

    

 

    

 

Raw materials

 

$

4,723

 

$

4,546

 

Finished goods

 

 

1,706

 

 

1,954

 

 

 

 

6,429

 

 

6,500

 

Service parts inventories

 

 

7,105

 

 

6,888

 

 

 

$

13,534

 

$

13,388