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LEASES - Operating and Financing Lease Cost (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Jan. 01, 2019
Lessee, Lease, Description [Line Items]          
Operating lease costs $ 0.1 $ 0.1 $ 0.2 $ 0.1  
Finance leases, amortization expense and interest $ 0.1   $ 0.1    
Minimum          
Lessee, Lease, Description [Line Items]          
Renewal term         1 year
Maximum          
Lessee, Lease, Description [Line Items]          
Renewal term         5 years