SEGMENT INFORMATION (SEGMENT FINANCIALS) (DETAILS) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Segment Reporting Information [Line Items]
Gross Revenue	$ 310,230	$ 295,506	$ 635,758	$ 597,730
Intersegment Sales	(7)	(16)	(14)	(19)
Net Revenue	310,223	295,490	635,744	597,711
Depreciation and amortization	15,680	14,089	31,043	27,259
Income (Loss) from Operations	23,352	20,667	49,480	45,024
Capital Expenditures	16,467	19,388	29,505	34,483
Total Assets	863,205		863,205		$ 852,475
Goodwill	126,798		126,798		128,705
Customer Management Services [Member]
Segment Reporting Information [Line Items]
Gross Revenue	219,316	218,683	462,325	446,607
Intersegment Sales	0	0	0	0
Net Revenue	219,316	218,683	462,325	446,607
Depreciation and amortization	11,053	10,169	21,850	19,634
Income (Loss) from Operations	13,324	16,493	35,026	37,316
Capital Expenditures	12,569	14,587	22,016	24,499
Total Assets	517,396		517,396		514,957
Goodwill	24,265		24,265		25,871
Customer Growth Services [Member]
Segment Reporting Information [Line Items]
Gross Revenue	30,570	28,875	56,526	57,780
Intersegment Sales	0	0	0	0
Net Revenue	30,570	28,875	56,526	57,780
Depreciation and amortization	1,523	1,468	3,008	3,024
Income (Loss) from Operations	2,122	1,831	2,148	3,601
Capital Expenditures	1,832	1,289	3,137	1,669
Total Assets	84,079		84,079		88,394
Goodwill	30,395		30,395		30,395
Customer Technology Services [Member]
Segment Reporting Information [Line Items]
Gross Revenue	38,094	35,753	73,815	68,532
Intersegment Sales	(7)	(16)	(14)	(19)
Net Revenue	38,087	35,737	73,801	68,513
Depreciation and amortization	2,195	2,008	4,359	3,723
Income (Loss) from Operations	3,250	1,616	5,259	1,927
Capital Expenditures	1,786	3,407	4,068	8,038
Total Assets	171,581		171,581		159,441
Goodwill	42,709		42,709		42,709
Customer Strategy Services [Member]
Segment Reporting Information [Line Items]
Gross Revenue	22,250	12,195	43,092	24,811
Intersegment Sales	0	0	0	0
Net Revenue	22,250	12,195	43,092	24,811
Depreciation and amortization	909	444	1,826	878
Income (Loss) from Operations	4,656	727	7,047	2,180
Capital Expenditures	280	$ 105	284	$ 277
Total Assets	90,149		90,149		89,683
Goodwill	$ 29,429		$ 29,429		$ 29,730