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PROPERTY, PLANT AND EQUIPMENT (Tables)
12 Months Ended
Dec. 31, 2021
Property, Plant and Equipment [Abstract]  
Schedule of Property, Plant and Equipment
Property, plant and equipment, net, consists of the following at December 31, 2021 and 2020: 
(thousands) 2021 2020
Land and improvements $ 17,454  $ 12,670 
Building and improvements 83,509  73,433 
Machinery and equipment 372,086  286,418 
Transportation equipment 10,402  8,200 
Leasehold improvements 21,593  18,928 
Property, plant and equipment, at cost 505,044  399,649 
Less: accumulated depreciation and amortization (185,551) (148,156)
Property, plant and equipment, net $ 319,493  $ 251,493