PROPERTY AND EQUIPMENT (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Property, Plant and Equipment, Net [Abstract]
Property and equipment, gross	$ 146,833	$ 146,035
Accumulated depreciation and amortization	(110,706)	(107,624)
Property and equipment, net	36,127	38,411
Depreciation expense	5,300	5,200	$ 5,100
Land and Land Improvements [Member]
Property, Plant and Equipment, Net [Abstract]
Property and equipment, gross	17,083	17,478
Buildings [Member]
Property, Plant and Equipment, Net [Abstract]
Property and equipment, gross	57,208	57,363
Equipment [Member]
Property, Plant and Equipment, Net [Abstract]
Property and equipment, gross	$ 72,542	$ 71,194

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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The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation.

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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.

+ References

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

+ References

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