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PROPERTY, PLANT AND EQUIPMENT (Tables)
9 Months Ended
Sep. 30, 2017
Property, Plant and Equipment [Abstract]  
Schedule of components of property, plant and equipment, net
Property, plant and equipment consists of the following (in thousands): 
 
September 30,
2017
 
December 31,
2016
Land, buildings and improvements
$
71,610

 
$
81,311

Machinery, equipment and fixtures
77,035

 
75,177

Office furniture, equipment and vehicles
23,408

 
22,471

Construction in progress
379

 
272

 
172,432

 
179,231

Accumulated depreciation
(121,863
)
 
(122,270
)
Property, plant and equipment, net
$
50,569

 
$
56,961