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Inventories (Tables)
 3 Months Ended
Mar. 31, 2018
Inventory Disclosure [Abstract]  
Inventories

Inventories at March 31, 2018 and December 31, 2017 consisted of the following:

 

 

 

March 31,

2018

 

 

December 31,

2017

 

 

 

(In thousands)

 

Raw materials and supplies

 

$

11,836

 

 

$

11,732

 

Work-in-process

 

 

—

 

 

 

50

 

Finished units

 

 

4,975

 

 

 

3,889

 

Inventories

 

$

16,811

 

 

$

15,671