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Inventory
 9 Months Ended
Sep. 30, 2018
Inventory.  
Inventory

4.  Inventory

 

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

 

 

 

 

 

 

 

 

 

 

    

September 30, 2018

    

December 31, 2017

 

Raw materials and supplies

 

$

40,119

 

$

42,851

 

Work-in-process

 

 

10,088

 

 

3,492

 

Finished goods

 

 

3,221

 

 

2,433

 

 

 

$

53,428

 

$

48,776

 

 

Raw materials and supplies include spare parts inventory held at service locations valued at $5.7  million and $5.5 million as of September 30, 2018 and December 31, 2017, respectively.