SEGMENT INFORMATION (SEGMENT FINANCIALS) (DETAILS) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Segment Reporting Information [Line Items]
Net Revenue	$ 338,277	$ 312,410
Depreciation and amortization	14,500	17,729
Income (Loss) from Operations	26,490	17,753
Capital Expenditures	12,035	14,949
Total Assets	840,151		$ 846,304
Goodwill	129,765		129,648
Operating Segments
Segment Reporting Information [Line Items]
Net Revenue	338,453	312,610
Intersegment Eliminations
Segment Reporting Information [Line Items]
Net Revenue	(176)	(200)
Customer Management Services
Segment Reporting Information [Line Items]
Net Revenue	252,079	227,921
Depreciation and amortization	11,242	12,254
Income (Loss) from Operations	20,596	15,595
Capital Expenditures	8,579	11,978
Total Assets	572,787		585,679
Goodwill	42,395		42,589
Customer Management Services | Operating Segments
Segment Reporting Information [Line Items]
Net Revenue	252,098	228,019
Customer Management Services | Intersegment Eliminations
Segment Reporting Information [Line Items]
Net Revenue	(19)	(98)
Customer Growth Services
Segment Reporting Information [Line Items]
Net Revenue	33,658	33,519
Depreciation and amortization	778	1,743
Income (Loss) from Operations	2,410	495
Capital Expenditures	120	1,187
Total Assets	69,422		71,540
Goodwill	24,439		24,439
Customer Growth Services | Operating Segments
Segment Reporting Information [Line Items]
Net Revenue	33,658	33,519
Customer Growth Services | Intersegment Eliminations
Segment Reporting Information [Line Items]
Net Revenue	0	0
Customer Technology Services
Segment Reporting Information [Line Items]
Net Revenue	35,693	35,268
Depreciation and amortization	1,812	2,875
Income (Loss) from Operations	3,057	2,780
Capital Expenditures	3,200	1,733
Total Assets	125,581		115,537
Goodwill	41,500		41,500
Customer Technology Services | Operating Segments
Segment Reporting Information [Line Items]
Net Revenue	35,850	35,370
Customer Technology Services | Intersegment Eliminations
Segment Reporting Information [Line Items]
Net Revenue	(157)	(102)
Customer Strategy Services
Segment Reporting Information [Line Items]
Net Revenue	16,847	15,702
Depreciation and amortization	668	857
Income (Loss) from Operations	427	(1,117)
Capital Expenditures	136	51
Total Assets	72,361		73,548
Goodwill	21,431		$ 21,120
Customer Strategy Services | Operating Segments
Segment Reporting Information [Line Items]
Net Revenue	16,847	15,702
Customer Strategy Services | Intersegment Eliminations
Segment Reporting Information [Line Items]
Net Revenue	$ 0	$ 0