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Property, Plant and Equipment (Tables)
 12 Months Ended
Dec. 31, 2018
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment
Property, plant and equipment consisted of the following (in thousands):
 
 
December 31,
 
 
2018
 
2017
Machinery, equipment and vehicles
 
$
18,121

 
$
16,078

Furniture and fixtures
 
3,779

 
3,090

Leasehold improvements
 
2,369

 
1,967

Buildings
 
311

 
331

 
 
24,580

 
21,466

Accumulated depreciation and amortization
 
(18,721
)
 
(16,343
)
 
 
$
5,859

 
$
5,123