Annual report pursuant to Section 13 and 15(d)

RESTRUCTURING RELATED EXPENSES (Narrative) (Details)

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RESTRUCTURING RELATED EXPENSES (Narrative) (Details)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2017
position
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Restructuring Cost and Reserve [Line Items]        
Restructuring expenses   $ 1,523 $ 1,483 $ 200
Number of positions eliminated | position 60      
Selling, General and Administrative Expenses        
Restructuring Cost and Reserve [Line Items]        
Restructuring expenses   1,500 1,500  
Selling, General and Administrative Expenses | PHILIPPINES        
Restructuring Cost and Reserve [Line Items]        
Restructuring expenses       $ 200
Selling, General and Administrative Expenses | Severance and termination benefits        
Restructuring Cost and Reserve [Line Items]        
Restructuring expenses   $ 300 $ 800