GOODWILL (GOODWILL ROLLFORWARD) (DETAILS) (USD $) In Thousands, unless otherwise specified	12 Months Ended							12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2012 Customer Management Services [Member]	Dec. 31, 2011 Customer Management Services [Member]	Dec. 31, 2012 Customer Growth Services [Member]	Dec. 31, 2011 Customer Growth Services [Member]	Dec. 31, 2010 Customer Growth Services [Member]	Dec. 31, 2012 Customer Technology Services [Member]	Dec. 31, 2011 Customer Technology Services [Member]	Dec. 31, 2012 Customer Strategy Services [Member]	Dec. 31, 2011 Customer Strategy Services [Member]
Goodwill [Line Items]
Beginning balance, goodwill	$ 70,844	$ 52,707	$ 20,594	$ 21,017	$ 24,439	$ 24,439	$ 24,439	$ 18,516		$ 7,295	$ 7,251
Acquisitions	24,141	18,560						20,075	18,516	4,066	44
Effect of Foreign Currency	(306)	(423)	(306)	(423)
Ending balance, goodwill	$ 94,679	$ 70,844	$ 20,288	$ 20,594	$ 24,439	$ 24,439	$ 24,439	$ 38,591	$ 18,516	$ 11,361	$ 7,295