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PROPERTY, PLANT AND EQUIPMENT - Narrative (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Property, Plant and Equipment [Abstract]      
Depreciation expense $ 24,000 $ 20,200 $ 19,700
Finance lease, right-of-use asset, net of accumulated amortization 2,802 2,945  
Finance lease, right-of-use asset, accumulated amortization $ 1,800 $ 1,700