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Inventory
 6 Months Ended
Jun. 30, 2018
Inventory.  
Inventory

4.  Inventory

 

Inventory as of June 30, 2018 and December 31, 2017 consists of the following (in thousands):

 

 

 

 

 

 

 

 

 

 

    

June 30, 2018

    

December 31, 2017

 

Raw materials and supplies

 

$

34,689

 

$

42,851

 

Work-in-process

 

 

4,584

 

 

3,492

 

Finished goods

 

 

3,015

 

 

2,433

 

 

 

$

42,288

 

$

48,776

 

 

Raw materials and supplies include spare parts inventory held at service locations valued at $4.7 million and $5.5 million as of June 30, 2018 and December 31, 2017, respectively.