PROPERTY, PLANT AND EQUIPMENT (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Property, Plant and Equipment [Abstract]
Gross property, plant and equipment	$ 354,381	$ 343,341
Less: accumulated depreciation	137,378	126,482
Property, plant and equipment, net	217,003	216,859
Land
Property, Plant and Equipment [Abstract]
Gross property, plant and equipment	11,432	11,588
Building
Property, Plant and Equipment [Abstract]
Gross property, plant and equipment	85,214	79,261
Equipment
Property, Plant and Equipment [Abstract]
Gross property, plant and equipment	241,446	237,898
Construction in progress
Property, Plant and Equipment [Abstract]
Gross property, plant and equipment	$ 16,289	$ 14,594

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

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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