PROPERTY PLANT AND EQUIPMENT (NARRATIVE) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Depreciation and amortization expense for property, plant and equipment	$ 62,700	$ 57,500	$ 58,400
Property, plant and equipment, net	178,706	176,633
Software Development [Member]
Property, plant and equipment, net	$ 16,200	$ 15,300