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CONCENTRATION OF RISK - Revenues and Accounts Receivable From Our Largest Customers (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Concentration Risk [Line Items]          
Accounts Receivable $ 66,952   $ 66,952   $ 43,129
Major Customer A [Member] | Total Revenue [Member] | Customer Concentration Risk [Member]          
Concentration Risk [Line Items]          
% of Total Revenue 39.00% 33.00% 39.00% 26.00%  
Major Customer A [Member] | Accounts Receivable [Member] | Customer Concentration Risk [Member]          
Concentration Risk [Line Items]          
Accounts Receivable $ 15,041   $ 15,041    
Major Customer B [Member] | Total Revenue [Member] | Customer Concentration Risk [Member]          
Concentration Risk [Line Items]          
% of Total Revenue 24.00% 9.00% 19.00% 9.00%  
Major Customer B [Member] | Accounts Receivable [Member] | Customer Concentration Risk [Member]          
Concentration Risk [Line Items]          
Accounts Receivable $ 17,088   $ 17,088    
Major Customer C [Member] | Total Revenue [Member] | Customer Concentration Risk [Member]          
Concentration Risk [Line Items]          
% of Total Revenue 23.00% 42.00% 26.00% 48.00%  
Major Customer C [Member] | Accounts Receivable [Member] | Customer Concentration Risk [Member]          
Concentration Risk [Line Items]          
Accounts Receivable $ 16,701   $ 16,701