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DISTRIBUTION AGREEMENTS (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
DISTRIBUTION AGREEMENTS        
Termination costs $ 5.5 $ 0.2 $ 12.5 $ 20.1
Distribution agreement (in years)     20 years  
Revenue recognized $ 11.0 $ 10.2 $ 22.2 $ 20.1