RESTRUCTURING CHARGES AND IMPAIRMENT LOSSES (LIABILITY CLASSIFICATION TABLE) (DETAILS) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Restructuring Cost and Reserve [Line Items]
Reduction in force									$ 1,814	$ 3,336	$ 4,137
Facility exit charges										14	298
Restructuring charges, net	$ 185	$ 622	$ 198	$ 809	$ 1,600	$ 593	$ 617	$ 540	1,814	3,350	4,435
Customer Management Services [Member]
Restructuring Cost and Reserve [Line Items]
Reduction in force									1,482	2,182	3,832
Facility exit charges									0	14	298
Customer Growth Services [Member]
Restructuring Cost and Reserve [Line Items]
Reduction in force									22	56	43
Facility exit charges									0	0	0
Customer Technology Services [Member]
Restructuring Cost and Reserve [Line Items]
Reduction in force									13	709	73
Facility exit charges									0	0	0
Customer Strategy Services [Member]
Restructuring Cost and Reserve [Line Items]
Reduction in force									297	389	189
Facility exit charges									$ 0	$ 0	$ 0