SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Property, Plant, and Equipment (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 168,557	$ 152,514
Less accumulated depreciation	(69,937)	(61,779)
Property, plant and equipment, net	98,620	90,735
Land and improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	13,960	13,953
Buildings and improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	83,320	73,121
Machinery and equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	53,787	50,235
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	11,163	9,172
Software costs
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 6,327	$ 6,033

Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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