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Property and Equipment (Tables)
12 Months Ended
Dec. 31, 2017
Property, Plant and Equipment [Abstract]  
Property, plant and equipment
Property and equipment, net, as of December 31, 2017 and 2016 consist of the following:
 
December 31,
 
2017
 
2016
Land
$
3,828

 
$
3,828

Building and improvements
24,038

 
21,717

Leasehold improvements
429

 
155

Machinery and equipment
53,217

 
41,777

Office and computer equipment
13,057

 
14,824

Motor vehicles
51

 
51

 
94,620

 
82,352

Less accumulated depreciation
(51,099
)
 
(45,766
)
 
$
43,521

 
$
36,586