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RESTRUCTURING CHARGES AND IMPAIRMENT (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($) employee
Restructuring Charges and Impairment
Restructuring charges	$ 1,655	$ 2,963	$ 10,313
Software impairment
Restructuring Charges and Impairment
Restructuring charges			6,244
Contract terminations
Restructuring Charges and Impairment
Restructuring charges	427		2,875
Severance and other
Restructuring Charges and Impairment
Restructuring charges	$ 1,228	$ 2,963	$ 1,194
Number of positions in headcount reduction | employee			130

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- Definition

The number of positions eliminated during the period as a result of restructuring activities.

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Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

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