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Inventories
 3 Months Ended
Mar. 31, 2016
Inventories  
Inventories

7.    Inventories

 

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,

 

 

 

2016

 

2015

 

Lime and limestone inventories:

    

 

    

    

 

    

 

Raw materials

 

$
5,815

 

$
6,627

 

Finished goods

 

 
1,810

 

 
2,049

 

 

 

$
7,625

 

$
8,676

 

Service parts inventories

 

 
6,147

 

 
6,052

 

 

 

$
13,772

 

$
14,728