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RESTRUCTURING AND OTHER CHARGES - Narrative (Details)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2018
USD ($)
Dec. 31, 2017
position
Dec. 31, 2017
USD ($)
Restructuring Cost and Reserve [Line Items]      
Charges     $ 1,600
2017 Strategic Restructuring Plan      
Restructuring Cost and Reserve [Line Items]      
Adjustments $ 44    
Restructuring charges, number of position eliminated | position   56  
Restructuring charges, percentage of position eliminated   41.00%  
2017 Strategic Restructuring Plan | Employee related      
Restructuring Cost and Reserve [Line Items]      
Charges     1,500
2017 Strategic Restructuring Plan | Facilities      
Restructuring Cost and Reserve [Line Items]      
Charges     $ 100