RESTRUCTURING AND INTEGRATION CHARGES AND IMPAIRMENT LOSSES (NARRATIVE) (DETAILS) - USD ($)	3 Months Ended		12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Reduction in force			$ 1,161,000	$ 3,400,000	$ 1,814,000
Facility exit charges			$ 2,219,000	992,000
Impaired Long-Lived Assets Held and Used, Asset Description			During each of the periods presented, the Company evaluated the annual 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.
Customer Management Services
Reduction in force			$ 1,012,000	2,837,000	1,482,000
Facility exit charges			2,050,000	959,000	0
Customer Management Services | Leasehold Improvements
Restructuring impairment losses			0	$ 0	$ 400,000
Connextions
Reduction in force			400,000
Termination fee			600,000
Integration charges	$ 3,900,000	$ 5,600,000
Facility exit charges			$ 1,400,000
Connextions | Leasehold Improvements
Integration charges	$ 3,500,000