RESTRUCTURING INITIATIVE (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Restructuring initiatives
Capital expenditures	$ 245,954	$ 242,276	$ 211,252
Restructuring reserve
Restructuring initiatives	26,492	20,472	63,829
Business Transformation
Restructuring initiatives
Restructuring charges including asset impairment	26,500
Asset impairment charges	2,500
Expected implementation costs	125,000
Cumulative expense incurred	113,000
Capital expenditures	50,000
Restructuring reserve
Restructuring reserve, balance at the beginning of the period	10,699
Restructuring initiatives	24,016	20,500	$ 63,800
Cash paid	(24,233)
Interest and FX impact	7
Restructuring reserve, balance at the end of the period	10,489	10,699
Business Transformation | Employee severance
Restructuring reserve
Restructuring reserve, balance at the beginning of the period	7,090
Restructuring initiatives	16,162
Cash paid	(14,731)
Interest and FX impact	(565)
Restructuring reserve, balance at the end of the period	7,956	7,090
Business Transformation | Professional fees and other costs
Restructuring reserve
Restructuring reserve, balance at the beginning of the period	3,609
Restructuring initiatives	7,854
Cash paid	(9,502)
Interest and FX impact	572
Restructuring reserve, balance at the end of the period	$ 2,533	$ 3,609