SEGMENT INFORMATION (SEGMENT FINANCIALS) (DETAILS) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013
Segment Reporting Information [Line Items]
Gross Revenue	$ 295,506	$ 290,337	$ 597,730	$ 579,658
Intersegment Sales	(16)	(645)	(19)	(1,583)
Net Revenue	295,490	289,692	597,711	578,075
Depreciation and amortization	14,089	11,263	27,259	21,818
Income (Loss) from Operations	20,667	19,675	45,024	42,673
Capital Expenditures	19,388	9,555	34,483	13,660
Total Assets	816,637		816,637		842,342
Goodwill	110,781		110,781		102,743
Customer Management Services [Member]
Segment Reporting Information [Line Items]
Gross Revenue	218,683	220,965	446,607	443,854
Intersegment Sales	0	(324)	0	(631)
Net Revenue	218,683	220,641	446,607	443,223
Depreciation and amortization	10,169	8,532	19,634	16,394
Income (Loss) from Operations	16,493	16,465	37,316	37,196
Capital Expenditures	14,587	8,110	24,499	10,396
Total Assets	531,926		531,926		554,015
Goodwill	27,240		27,240		19,819
Customer Growth Services [Member]
Segment Reporting Information [Line Items]
Gross Revenue	28,875	22,399	57,780	45,255
Intersegment Sales	0	0	0	0
Net Revenue	28,875	22,399	57,780	45,255
Depreciation and amortization	1,468	777	3,024	1,474
Income (Loss) from Operations	1,831	(620)	3,601	656
Capital Expenditures	1,289	435	1,669	751
Total Assets	84,058		84,058		86,416
Goodwill	30,395		30,395		30,128
Customer Technology Services [Member]
Segment Reporting Information [Line Items]
Gross Revenue	35,753	36,717	68,532	70,363
Intersegment Sales	(16)	(73)	(19)	(157)
Net Revenue	35,737	36,644	68,513	70,206
Depreciation and amortization	2,008	1,489	3,723	3,005
Income (Loss) from Operations	1,616	5,819	1,927	8,717
Capital Expenditures	3,407	960	8,038	2,288
Total Assets	153,552		153,552		157,040
Goodwill	42,709		42,709		42,709
Customer Strategy Services [Member]
Segment Reporting Information [Line Items]
Gross Revenue	12,195	10,256	24,811	20,186
Intersegment Sales	0	(248)	0	(795)
Net Revenue	12,195	10,008	24,811	19,391
Depreciation and amortization	444	465	878	945
Income (Loss) from Operations	727	(1,989)	2,180	(3,896)
Capital Expenditures	105	50	277	225
Total Assets	47,101		47,101		44,871
Goodwill	$ 10,437		$ 10,437		$ 10,087