RESTRUCTURING INITIATIVES - Business Transformation Activity (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Restructuring reserve
Restructuring reserve, balance at the beginning of the period	$ 10,489
Restructuring initiatives	3,672	$ 4,839
Cash Paid	(5,648)
Interest and FX Impact	(205)
Restructuring reserve, balance at the end of the period	8,308
Employee severance
Restructuring reserve
Restructuring reserve, balance at the beginning of the period	7,956
Restructuring initiatives	(260)
Cash Paid	(2,425)
Interest and FX Impact	(163)
Restructuring reserve, balance at the end of the period	5,108
Professional fees and other costs
Restructuring reserve
Restructuring reserve, balance at the beginning of the period	2,533
Restructuring initiatives	3,932
Cash Paid	(3,223)
Interest and FX Impact	(42)
Restructuring reserve, balance at the end of the period	$ 3,200