SEGMENT INFORMATION (SEGMENT FINANCIALS) (DETAILS) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Segment Reporting Information [Line Items]
Gross Revenue	$ 305,313	$ 310,230	$ 617,923	$ 635,758
Intersegment Sales	(208)	(7)	(408)	(14)
Net Revenue	305,105	310,223	617,515	635,744
Depreciation and amortization	17,221	15,680	34,950	31,043
Income (Loss) from Operations	16,228	23,352	33,981	49,480
Capital Expenditures	12,794	16,467	27,743	29,505
Total Assets	822,148		822,148		$ 843,327
Goodwill	114,092		114,092		114,183
Customer Management Services [Member]
Segment Reporting Information [Line Items]
Gross Revenue	212,886	219,316	440,905	462,325
Intersegment Sales	(79)		(177)	0
Net Revenue	212,807	219,316	440,728	462,325
Depreciation and amortization	11,879	11,053	24,133	21,850
Income (Loss) from Operations	8,339	13,324	23,934	35,026
Capital Expenditures	9,260	12,569	21,238	22,016
Total Assets	489,177		489,177		512,100
Goodwill	22,106		22,106		22,009
Customer Growth Services [Member]
Segment Reporting Information [Line Items]
Gross Revenue	36,893	30,570	70,412	56,526
Intersegment Sales	0			0
Net Revenue	36,893	30,570	70,412	56,526
Depreciation and amortization	1,639	1,523	3,382	3,008
Income (Loss) from Operations	3,482	2,122	3,977	2,148
Capital Expenditures	1,984	1,832	3,171	3,137
Total Assets	79,085		79,085		75,291
Goodwill	24,439		24,439		24,439
Customer Technology Services [Member]
Segment Reporting Information [Line Items]
Gross Revenue	37,479	38,094	72,849	73,815
Intersegment Sales	(129)	(7)	(231)	(14)
Net Revenue	37,350	38,087	72,618	73,801
Depreciation and amortization	2,855	2,195	5,730	4,359
Income (Loss) from Operations	3,376	3,250	6,156	5,259
Capital Expenditures	1,280	1,786	3,013	4,068
Total Assets	160,139		160,139		159,850
Goodwill	42,863		42,863		42,709
Customer Strategy Services [Member]
Segment Reporting Information [Line Items]
Gross Revenue	18,055	22,250	33,757	43,092
Intersegment Sales	0			0
Net Revenue	18,055	22,250	33,757	43,092
Depreciation and amortization	848	909	1,705	1,826
Income (Loss) from Operations	1,031	4,656	(86)	7,047
Capital Expenditures	270	$ 280	321	$ 284
Total Assets	93,747		93,747		96,086
Goodwill	$ 24,684		$ 24,684		$ 25,026