PROPERTY, PLANT AND EQUIPMENT (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Property, Plant and Equipment [Line Items]
Property, plant and equipment, at cost	$ 303,008	$ 276,374
Less: accumulated depreciation and amortization	(122,159)	(99,229)
Property, plant and equipment, net	180,849	177,145
Depreciation expense	26,900	20,800	$ 14,200
Land and improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, at cost	9,754	8,686
Building and improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, at cost	67,493	59,701
Machinery and equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, at cost	204,383	191,142
Transportation equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, at cost	6,640	4,972
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, at cost	$ 14,738	$ 11,873