Annual report pursuant to Section 13 and 15(d)

RESTRUCTURING RELATED EXPENSES (Details)

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RESTRUCTURING RELATED EXPENSES (Details)
$ in Thousands
 1 Months Ended 3 Months Ended 12 Months Ended
Apr. 30, 2015
position
Dec. 31, 2017
position
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Restructuring Cost and Reserve [Line Items]            
Number of positions eliminated | position 100 60        
Restructuring expenses       $ 1,483 $ 200 $ 3,306
Selling, General and Administrative Expenses            
Restructuring Cost and Reserve [Line Items]            
Restructuring expenses     $ 1,500   3,300  
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     $ 800   2,800  
Selling, General and Administrative Expenses | Other exit costs            
Restructuring Cost and Reserve [Line Items]            
Restructuring expenses         $ 500