PROPERTY, PLANT AND EQUIPMENT (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Property, plant and equipment
Property, plant and equipment, gross	$ 92,392		$ 90,361
Less accumulated depreciation	(44,309)		(42,326)
Property, plant and equipment, net	48,083		48,035
Depreciation expense	2,227	$ 1,907
Land
Property, plant and equipment
Property, plant and equipment, gross	977		981
Building and improvements
Property, plant and equipment
Property, plant and equipment, gross	13,092		13,054
Machinery, equipment, tools and dies
Property, plant and equipment
Property, plant and equipment, gross	62,700		60,755
Furniture, fixtures and other
Property, plant and equipment
Property, plant and equipment, gross	$ 15,623		$ 15,571

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.

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