ACQUISITIONS AND DIVESTITURES (DETAILS) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Assets and Liabilities Held for Sale [Line Items]
Loss on assets held-for-sale	$ 2,578
Total assets held for sale	7,835	$ 10,715
Total liabilities held for sale	1,322	$ 1,357
Business Unit From Customer Growth Services And Customer Strategy Services Segments | Disposal Group, Held-for-sale, Not Discontinued Operations
Assets and Liabilities Held for Sale [Line Items]
Accounts receivable, net - assets held for sale	6,151
Other assets held for sale	303
Property, Plant and Equipment - assets held for sale	49
Goodwill - assets held for sale	3,033
Allowance for reduction of assets held for sale	(2,700)
Total assets held for sale	7,835
Accounts payable held for sale	413
Accrued employee compensation and benefits	833
Accrued expenses.	54
Other liabilities held for sale	22
Total liabilities held for sale	1,322
Business Unit From Customer Growth Services And Customer Strategy Services Segments | Disposal Group, Held-for-sale, Not Discontinued Operations | Customer Relationships
Assets and Liabilities Held for Sale [Line Items]
Intangible assets held for sale	$ 999