SEGMENT INFORMATION (SEGMENT FINANCIALS) (DETAILS) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Segment Reporting Information [Line Items]
Net Revenue	$ 312,796	$ 309,195	$ 930,311	$ 944,939
Depreciation and amortization	16,811	15,486	51,761	46,529
Income (Loss) from Operations	12,526	15,625	46,507	65,105
Capital Expenditures	11,120	19,679	38,863	49,184
Total Assets	807,287		807,287		$ 843,327
Goodwill	111,088		111,088		114,183
Operating Segments
Segment Reporting Information [Line Items]
Net Revenue	313,165	309,202	931,088	944,960
Intersegment Eliminations
Segment Reporting Information [Line Items]
Net Revenue	(369)	(7)	(777)	(21)
Customer Management Services
Segment Reporting Information [Line Items]
Net Revenue	223,664	212,690	664,392	675,015
Depreciation and amortization	11,891	10,900	36,024	32,750
Income (Loss) from Operations	12,255	8,930	36,189	43,956
Capital Expenditures	8,515	13,529	29,751	35,545
Total Assets	495,427		495,427		512,100
Goodwill	22,169		22,169		22,009
Customer Management Services | Operating Segments
Segment Reporting Information [Line Items]
Net Revenue	223,742	212,690	664,647	675,015
Customer Management Services | Intersegment Eliminations
Segment Reporting Information [Line Items]
Net Revenue	(78)		(255)	0
Customer Growth Services
Segment Reporting Information [Line Items]
Net Revenue	35,301	33,853	105,713	90,379
Depreciation and amortization	1,561	1,535	4,943	4,543
Income (Loss) from Operations	161	(257)	4,138	1,891
Capital Expenditures	375	1,148	3,546	4,285
Total Assets	75,595		75,595		75,291
Goodwill	24,439		24,439		24,439
Customer Growth Services | Operating Segments
Segment Reporting Information [Line Items]
Net Revenue	35,301	33,853	105,713	90,379
Customer Growth Services | Intersegment Eliminations
Segment Reporting Information [Line Items]
Net Revenue	0			0
Customer Technology Services
Segment Reporting Information [Line Items]
Net Revenue	36,580	42,134	109,198	115,935
Depreciation and amortization	2,457	2,447	8,187	6,806
Income (Loss) from Operations	3,776	3,774	9,932	9,033
Capital Expenditures	1,864	4,883	4,877	8,950
Total Assets	156,969		156,969		159,850
Goodwill	42,863		42,863		42,709
Customer Technology Services | Operating Segments
Segment Reporting Information [Line Items]
Net Revenue	36,871	42,141	109,720	115,956
Customer Technology Services | Intersegment Eliminations
Segment Reporting Information [Line Items]
Net Revenue	(291)	(7)	(522)	(21)
Customer Strategy Services
Segment Reporting Information [Line Items]
Net Revenue	17,251	20,518	51,008	63,610
Depreciation and amortization	902	604	2,607	2,430
Income (Loss) from Operations	(3,666)	3,178	(3,752)	10,225
Capital Expenditures	366	119	689	404
Total Assets	79,296		79,296		96,086
Goodwill	21,617		21,617		$ 25,026
Customer Strategy Services | Operating Segments
Segment Reporting Information [Line Items]
Net Revenue	17,251	$ 20,518	$ 51,008	63,610
Customer Strategy Services | Intersegment Eliminations
Segment Reporting Information [Line Items]
Net Revenue	$ 0			$ 0