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Property, Plant and Equipment
 12 Months Ended
Dec. 31, 2016
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,
 
 
2016
 
2015
Machinery, equipment and vehicles
 
$
14,810

 
$
15,214

Furniture and fixtures
 
3,118

 
3,254

Leasehold improvements
 
1,823

 
1,798

Buildings
 
302

 
363

 
 
20,053

 
20,629

Accumulated depreciation and amortization
 
(15,506
)
 
(14,384
)
 
 
$
4,547

 
$
6,245


 
Depreciation expense was $2.9 million, $3.5 million and $3.9 million for the years ended December 31, 2016, 2015 and 2014, respectively.