SEGMENT INFORMATION (SEGMENT FINANCIALS) (DETAILS) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012
Segment Reporting Information [Line Items]
Gross Revenue	$ 297,370	$ 289,373	$ 877,028	$ 872,884
Intersegment Sales	(375)	(3,105)	(1,958)	(5,164)
Net Revenue	296,995	286,268	875,070	867,720
Depreciation and amortization	11,463	10,695	33,281	31,040
Income (Loss) from Operations	25,961	27,361	68,634	52,557
Capital Expenditures	18,172	15,781	31,832	33,259
Total Assets	838,369		838,369		847,173
Goodwill	98,695		98,695		94,679
Customer Management Services [Member]
Segment Reporting Information [Line Items]
Gross Revenue	217,347	224,041	661,201	688,318
Intersegment Sales	(312)	0	(943)	0
Net Revenue	217,035	224,041	660,258	688,318
Depreciation and amortization	8,322	8,349	24,716	24,811
Income (Loss) from Operations	17,944	21,001	55,140	38,438
Capital Expenditures	15,108	11,752	25,504	27,171
Total Assets	547,320		547,320		588,627
Goodwill	19,981		19,981		20,288
Customer Growth Services [Member]
Segment Reporting Information [Line Items]
Gross Revenue	25,893	28,200	71,148	75,373
Intersegment Sales	0	0	0	0
Net Revenue	25,893	28,200	71,148	75,373
Depreciation and amortization	1,148	1,201	2,622	2,899
Income (Loss) from Operations	588	2,487	1,244	1,409
Capital Expenditures	1,274	2,385	2,025	3,428
Total Assets	85,924		85,924		54,164
Goodwill	29,481		29,481		24,439
Customer Technology Services [Member]
Segment Reporting Information [Line Items]
Gross Revenue	40,712	25,219	111,075	76,570
Intersegment Sales	(63)	(2,876)	(220)	(3,719)
Net Revenue	40,649	22,343	110,855	72,851
Depreciation and amortization	1,538	794	4,543	2,286
Income (Loss) from Operations	5,165	3,054	13,882	11,089
Capital Expenditures	1,642	1,346	3,930	2,216
Total Assets	155,466		155,466		148,043
Goodwill	39,146		39,146		38,591
Customer Strategy Services [Member]
Segment Reporting Information [Line Items]
Gross Revenue	13,418	11,913	33,604	32,623
Intersegment Sales	0	(229)	(795)	(1,445)
Net Revenue	13,418	11,684	32,809	31,178
Depreciation and amortization	455	351	1,400	1,044
Income (Loss) from Operations	2,264	819	(1,632)	1,621
Capital Expenditures	148	298	373	444
Total Assets	49,659		49,659		56,339
Goodwill	$ 10,087		$ 10,087		$ 11,361