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ACCOUNTING POLICIES - (Details) - Customers and customer group
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Sales | Customer A          
Concentration of Credit Risk          
Concentration risk (as a percent) 21.00% 9.00% 20.00% 11.00%  
Sales | Customer B          
Concentration of Credit Risk          
Concentration risk (as a percent) 11.00% 4.00% 12.00% 5.00%  
Factored Accounts Receivable | Customer A and B          
Concentration of Credit Risk          
Concentration risk (as a percent)     67.00%   47.00%