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RESTRUCTURING CHARGES (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 employee
Restructuring Charges
Restructuring charges	$ 1,655	$ 2,963
Contract terminations
Restructuring Charges
Restructuring charges	427
Severance and other
Restructuring Charges
Restructuring charges	$ 1,228	$ 2,963
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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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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