PROPERTY, PLANT AND EQUIPMENT (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Property, Plant and Equipment [Abstract]
Gross property, plant and equipment	$ 322,559	$ 304,326
Less: accumulated depreciation	121,754	113,407
Property, plant and equipment, net	200,805	190,919
Land
Property, Plant and Equipment [Abstract]
Gross property, plant and equipment	11,427	7,965
Building
Property, Plant and Equipment [Abstract]
Gross property, plant and equipment	73,948	67,702
Equipment
Property, Plant and Equipment [Abstract]
Gross property, plant and equipment	219,680	213,909
Construction in progress
Property, Plant and Equipment [Abstract]
Gross property, plant and equipment	$ 17,504	$ 14,750

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.

+ 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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