SIGNIFICANT CLIENTS(NARRATIVE) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Entity Wide Revenue Major Customer Line Items
Revenue	$ 394,356	$ 375,249
Customer Management Services [Member]
Entity Wide Revenue Major Customer Line Items
Revenue	289,569	$ 292,641
Sears
Entity Wide Revenue Major Customer Line Items
Accounts receivable amount from major customer	$ 2,700
Customer Concentration Risk
Entity Wide Revenue Major Customer Line Items
Concentration risk percentage	10.00%
Customer Concentration Risk | Healthcare client
Entity Wide Revenue Major Customer Line Items
Concentration risk percentage	11.10%	11.30%
Minimum | Customer Concentration Risk | Revenue
Entity Wide Revenue Major Customer Line Items
Revenue	$ 100,000