RESTRUCTURING AND INTEGRATION EXPENSE (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Restructuring and integration expense [Line Items]
Restructuring and integration expense	$ 17,862	$ 21,551	$ 58,947	$ 79,339	$ 74,810
Total cost of revenue [Member]
Restructuring and integration expense [Line Items]
Restructuring and integration expense			4,197	3,465	3,562
Operating expenses [Member]
Restructuring and integration expense [Line Items]
Restructuring and integration expense			54,750	75,874	71,248
External consulting fees [Member]
Restructuring and integration expense [Line Items]
Restructuring and integration expense			26,676	44,096	45,638
Employee severance [Member]
Restructuring and integration expense [Line Items]
Restructuring and integration expense			10,897	19,025	11,516
Restructuring and integration expense, net of reversals			9,076	17,628	10,865
Internal labor [Member]
Restructuring and integration expense [Line Items]
Restructuring and integration expense			7,948	7,568	12,115
Other costs [Member]
Restructuring and integration expense [Line Items]
Restructuring and integration expense			$ 15,247	$ 10,047	$ 6,192