RESTRUCTURING AND INTEGRATION CHARGES AND IMPAIRMENT LOSSES (LIABILITY CLASSIFICATION TABLE) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Restructuring Cost and Reserve [Line Items]
Reduction in force	$ 179	$ (200)	$ 570	$ 1,654
Facility exit charges	2,537	621	4,029	747
Restructuring charges, net	2,716	6,006	4,599	9,768
Customer Management Services [Member]
Restructuring Cost and Reserve [Line Items]
Reduction in force	97	(213)	437	1,548
Facility exit charges	2,462	600	3,313	642
Customer Growth Services [Member]
Restructuring Cost and Reserve [Line Items]
Facility exit charges	75		716
Customer Technology Services [Member]
Restructuring Cost and Reserve [Line Items]
Reduction in force				93
Facility exit charges				84
Customer Strategy Services [Member]
Restructuring Cost and Reserve [Line Items]
Reduction in force	$ 82	13	$ 133	13
Facility exit charges		$ 21		$ 21