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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Name:	us-gaap_RestructuringCharges
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

RESTRUCTURING CHARGES - Narrative (Details) $ in Thousands	3 Months Ended			12 Months Ended
RESTRUCTURING CHARGES - Narrative (Details) $ in Thousands	Jun. 30, 2019 USD ($)	Dec. 31, 2018 employee	Jun. 30, 2018 USD ($)	Mar. 31, 2019 employee
Restructuring Cost and Reserve [Line Items]
Number of employees terminated \| employee		61
Restructuring charges	$ 123		$ 1,147
Employee-Related
Restructuring Cost and Reserve [Line Items]
Restructuring charges			$ 1,100
VSP
Restructuring Cost and Reserve [Line Items]
Number of employees terminated \| employee				155
Restructuring charges	$ 100