SEGMENT INFORMATION (SEGMENT FINANCIALS) (DETAILS) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013
Segment Reporting Information [Line Items]
Gross Revenue	$ 305,909	$ 297,370	$ 903,639	$ 877,028
Intersegment Sales	(9)	(375)	(28)	(1,958)
Net Revenue	305,900	296,995	903,611	875,070
Depreciation and amortization	13,893	11,463	41,152	33,281
Income (Loss) from Operations	21,323	25,961	66,347	68,634
Capital Expenditures	17,751	18,172	52,234	31,832
Total Assets	861,309		861,309		842,342
Goodwill	128,830		128,830		102,743
Customer Management Services [Member]
Segment Reporting Information [Line Items]
Gross Revenue	226,814	217,347	673,421	661,201
Intersegment Sales	0	(312)	0	(943)
Net Revenue	226,814	217,035	673,421	660,258
Depreciation and amortization	9,973	8,322	29,607	24,716
Income (Loss) from Operations	18,625	17,944	55,941	55,140
Capital Expenditures	13,891	15,108	38,390	25,504
Total Assets	540,868		540,868		554,015
Goodwill	27,274		27,274		19,819
Customer Growth Services [Member]
Segment Reporting Information [Line Items]
Gross Revenue	28,765	25,893	86,545	71,148
Intersegment Sales	0	0	0	0
Net Revenue	28,765	25,893	86,545	71,148
Depreciation and amortization	1,511	1,148	4,535	2,622
Income (Loss) from Operations	1,800	588	5,401	1,244
Capital Expenditures	1,270	1,274	2,939	2,025
Total Assets	85,202		85,202		86,416
Goodwill	30,395		30,395		30,128
Customer Technology Services [Member]
Segment Reporting Information [Line Items]
Gross Revenue	35,203	40,712	103,735	111,075
Intersegment Sales	(9)	(63)	(28)	(220)
Net Revenue	35,194	40,649	103,707	110,855
Depreciation and amortization	1,927	1,538	5,650	4,543
Income (Loss) from Operations	(286)	5,165	1,641	13,882
Capital Expenditures	2,371	1,642	10,409	3,930
Total Assets	168,026		168,026		157,040
Goodwill	42,709		42,709		42,709
Customer Strategy Services [Member]
Segment Reporting Information [Line Items]
Gross Revenue	15,127	13,418	39,938	33,604
Intersegment Sales	0	0	0	(795)
Net Revenue	15,127	13,418	39,938	32,809
Depreciation and amortization	482	455	1,360	1,400
Income (Loss) from Operations	1,184	2,264	3,364	(1,632)
Capital Expenditures	219	148	496	373
Total Assets	67,213		67,213		44,871
Goodwill	$ 28,452		$ 28,452		$ 10,087