RESTRUCTURING AND INTEGRATION CHARGES AND IMPAIRMENT LOSSES (LIABILITY CLASSIFICATION TABLE) (DETAILS) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Restructuring Cost and Reserve [Line Items]
Reduction in force	$ (200)	$ 2,989	$ 1,654	$ 3,006
Facility exit charges	621	699	747	885
Restructuring charges, net	6,006	3,688	9,768	3,890
Customer Management Services
Restructuring Cost and Reserve [Line Items]
Reduction in force	(213)	2,485	1,548	2,482
Facility exit charges	600	699	642	852
Customer Growth Services
Restructuring Cost and Reserve [Line Items]
Reduction in force		108		108
Customer Technology Services
Restructuring Cost and Reserve [Line Items]
Reduction in force		314	93	324
Facility exit charges			84	33
Customer Strategy Services
Restructuring Cost and Reserve [Line Items]
Reduction in force	13	$ 82	13	$ 92
Facility exit charges	$ 21		$ 21