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BORROWINGS - Narrative (Details) - USD ($)
Nov. 01, 2018
Nov. 08, 2018
Aug. 03, 2017
HSBC Bank and Citibank - Syndicated loan (United States)      
Disclosure of detailed information about borrowings [line items]      
Line of credit facility, maximum borrowing capacity     $ 40,000,000
Amended and Restated Credit Agreement      
Disclosure of detailed information about borrowings [line items]      
Line of credit facility, maximum borrowing capacity $ 50,000,000    
Revolving Credit Facility | Amended and Restated Credit Agreement      
Disclosure of detailed information about borrowings [line items]      
Line of credit facility, maximum borrowing capacity $ 150,000,000    
Line of credit facility, additional borrowing capacity   $ 100,000,000  
Coverage ratio 125.00%    
Leverage ratio 250.00%    
Maximum amount of restricted payments $ 10,000,000    
Maximum of advances outstanding   $ 50,000  
Payables maximum over average monthly billings 5    
Period preceding average monthly amount of affiliates’ billings 12 months    
Capital expenditures, limited percentage of net revenues 10.00%    
Percentage of capital expenditures over annual consolidated revenue 60.00%    
Revolving Credit Facility | LIBOR | Amended and Restated Credit Agreement      
Disclosure of detailed information about borrowings [line items]      
Borrowings, interest rate   1.75%