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DISTRIBUTION AGREEMENTS (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
DISTRIBUTION AGREEMENTS        
Termination costs $ 0.3 $ 5.5 $ 11.0 $ 12.5
Distribution agreement (in years)     20 years  
Revenue recognized $ 10.6 $ 11.0 $ 24.8 $ 22.2