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Property, Plant and Equipment
 12 Months Ended
Dec. 31, 2017
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment
Property, Plant and Equipment

Property, plant and equipment consisted of the following (in thousands):
 
 
December 31,
 
 
2017
 
2016
Machinery, equipment and vehicles
 
$
16,078

 
$
14,810

Furniture and fixtures
 
3,090

 
3,118

Leasehold improvements
 
1,967

 
1,823

Buildings
 
331

 
302

 
 
21,466

 
20,053

Accumulated depreciation and amortization
 
(16,343
)
 
(15,506
)
 
 
$
5,123

 
$
4,547


 
Depreciation expense was $2.6 million, $2.9 million and $3.5 million for the years ended December 31, 2017, 2016 and 2015, respectively.