SEGMENT INFORMATION (SEGMENT FINANCIALS) (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
Segment Reporting Information [Line Items]
Net Revenue	$ 295,261	$ 286,268	$ 288,798	$ 292,654	$ 300,538	$ 304,235	$ 293,636	$ 280,979	$ 1,162,981	$ 1,179,388	$ 1,094,906
Depreciation and amortization	10,126	10,695	10,229	10,116	10,061	11,807	11,423	11,598	41,166	44,889	50,218
Income (Loss) from Operations	25,988	27,361	6,446	18,750	20,763	26,572	24,629	21,490	78,545	93,454	73,745
Capital Expenditures									40,653	38,667	26,800
Total Assets	847,173				746,978				847,173	746,978	660,623
Goodwill	94,679				70,844				94,679	70,844	52,707
Customer Management Services [Member]
Segment Reporting Information [Line Items]
Gross Revenue									923,774	983,627	1,001,520
Intersegment Sales									0	0
Net Revenue									923,774	983,627	1,001,520
Depreciation and amortization									32,715	37,561	46,444
Income (Loss) from Operations									60,271	71,945	62,403
Capital Expenditures									32,736	33,931	24,446
Total Assets	588,627				567,852				588,627	567,852	558,946
Goodwill	20,288				20,594				20,288	20,594	21,017
Customer Growth Services [Member]
Segment Reporting Information [Line Items]
Gross Revenue									100,846	95,629	78,991
Intersegment Sales									(74)	0
Net Revenue									100,772	95,629	78,991
Depreciation and amortization									3,903	3,714	3,579
Income (Loss) from Operations									2,258	6,387	4,305
Capital Expenditures									3,983	2,346	2,326
Total Assets	54,164				56,038				54,164	56,038	57,404
Goodwill	24,439				24,439				24,439	24,439	24,439
Customer Technology Services [Member]
Segment Reporting Information [Line Items]
Gross Revenue									101,430	68,333	12,123
Intersegment Sales									(4,582)	(1,355)
Net Revenue									96,848	66,978	12,123
Depreciation and amortization									3,026	2,515	157
Income (Loss) from Operations									15,714	13,652	7,316
Capital Expenditures									3,390	1,842	10
Total Assets	148,043				78,823				148,043	78,823	1,207
Goodwill	38,591				18,516				38,591	18,516
Customer Strategy Services [Member]
Segment Reporting Information [Line Items]
Gross Revenue									43,358	33,154	2,272
Intersegment Sales									(1,771)	0
Net Revenue									41,587	33,154	2,272
Depreciation and amortization									1,522	1,099	38
Income (Loss) from Operations									302	1,470	(279)
Capital Expenditures									544	548	18
Total Assets	56,339				44,265				56,339	44,265	43,066
Goodwill	$ 11,361				$ 7,295				$ 11,361	$ 7,295	$ 7,251