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PROPERTY, PLANT AND EQUIPMENT (Tables)
 12 Months Ended
Dec. 31, 2018
Property, Plant and Equipment [Abstract]  
Schedule of property, plant and equipment
Property, plant and equipment, net, consists of the following classes at December 31, 2018 and 2017: 
(thousands)
 
2018

 
2017

Land and improvements
 
$
8,686

 
$
6,624

Building and improvements
 
59,701

 
45,416

Machinery and equipment
 
191,142

 
139,443

Transportation equipment
 
4,972

 
3,602

Leasehold improvements
 
11,873

 
8,354

Property, plant and equipment, at cost
 
276,374

 
203,439

Less: accumulated depreciation and amortization
 
(99,229
)
 
(84,953
)
Property, plant and equipment, net
 
$
177,145

 
$
118,486