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FINANCIAL INSTRUMENTS - Narrative (Details)
$ in Thousands, £ in Millions
6 Months Ended
Jun. 30, 2018
USD ($)
Jun. 30, 2018
GBP (£)
Mar. 31, 2018
USD ($)
shares
Dec. 31, 2017
USD ($)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Unrealized loss recorded in the statement of income relating to the foreign currency derivative $ 400      
Cognical Holdings, Inc.        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Cost method, ownership (as percen) 10.40%      
Cognical Holdings, Inc.        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Business combination, preferred shares purchased (in shares) | shares     560,872  
Purchase of cost method investment     $ 1,000  
Foreign Exchange Forward        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Forward hedge agreement | £   £ 7.9    
Estimated Fair Value        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Credit services organization guarantee liability $ 11,619     $ 17,795
Maximum        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Loans receivable, expected term 60 months