PROPERTY, PLANT AND EQUIPMENT - Long-Lived Assets by Geographical Area (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets, excluding intangible assets	$ 216,859	$ 190,919
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets, excluding intangible assets	178,895	167,410
Foreign Countries
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets, excluding intangible assets	$ 37,964	$ 23,509