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SEGMENT AND GEOGRAPHIC INFORMATION - Concentration (Details) - Net product sales - A major customer
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Wal-Mart      
Concentration of Risk      
Revenues from a major customer (as a percent) 24.00% 23.30% 23.70%
McLane      
Concentration of Risk      
Revenues from a major customer (as a percent) 16.90% 16.30% 16.70%