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LONG-TERM DEBT - Equipment financing and other (Details)
$ in Millions
Nov. 06, 2019
USD ($)
payment
May 17, 2019
USD ($)
May 2019 Equipment Financing    
Long-Term Debt    
Principal amount   $ 10.0
Term   36 months
Effective interest rate (as a percent)   6.25%
November 2019 Equipment Financing    
Long-Term Debt    
Principal amount $ 53.1  
Term 4 years  
Effective interest rate (as a percent) 4.75%  
Number of monthly payments | payment 47  
Periodic Payment $ 1.0  
Balloon payment on maturity $ 11.6