RESTRUCTURING CHARGES AND IMPAIRMENT LOSSES (LIABILITY CLASSIFICATION TABLE) (DETAILS) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Restructuring Cost and Reserve [Line Items]
Facility exit charges											$ 409
Restructuring charges, net	2,181	2,440	16,296	1,958	1,353	1,616	(57)	739	22,875	3,651	13,476
Closure of Delivery Centers [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges, net									243	74	409
Reduction in Force [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges, net									22,632	3,577	13,067
Customer Management Services [Member]
Restructuring Cost and Reserve [Line Items]
Reduction in force									22,371	3,444	13,050
Facility exit charges									243	74
Customer Growth Services [Member]
Restructuring Cost and Reserve [Line Items]
Reduction in force									201	133	15
Customer Technology Services [Member]
Restructuring Cost and Reserve [Line Items]
Reduction in force									$ 60