RESTRUCTURING CHARGES AND IMPAIRMENT LOSSES (NARRATIVE) (DETAILS) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Restructuring Cost and Reserve [Line Items]
Impaired Long-Lived Assets Held and Used, Asset Description	During each of the periods presented, the Company evaluated the recoverability of its leasehold improvement assets at certain customer engagement centers.
Impaired Long-Lived Assets Held and Used, Method for Determining Fair Value	To determine fair value, the Company used Level 3 inputs in its discounted cash flows analysis. Assumptions included the amount and timing of estimated future cash flows and assumed discount rates.
Goodwill Impairment Loss	$ (1,363)	$ (7,725)
Restructuring Reserve	1,566	806	$ 2,071
Payments	3,540	2,869
Customer Management Services
Restructuring Cost and Reserve [Line Items]
Impairment of Leasehold	0	400	$ 400
Goodwill Impairment Loss	$ (1,363)	(1,769)
Customer Growth Services
Restructuring Cost and Reserve [Line Items]
Goodwill Impairment Loss		$ (5,956)