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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 consists of the following (in thousands): 
 
December 31,
2017
 
December 31,
2016
Land, buildings, and improvements
$
71,914

 
$
81,311

Machinery, equipment, and fixtures
78,168

 
75,177

Office furniture, equipment, and vehicles
23,633

 
22,471

Construction in progress
300

 
272

 
174,015

 
179,231

Accumulated depreciation
(123,225
)
 
(122,270
)
Property, plant and equipment, net
$
50,790

 
$
56,961


Depreciation expense was $6.3 million, $6.6 million, and $7.0 million for the years ended December 31, 2017, 2016 and 2015, respectively.