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LONG-TERM DEBT - Credit Facility (Details) - Credit Facility - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2020
Sep. 07, 2017
Long-term debt    
Extension term 1 year  
Maximum borrowing capacity   $ 200.0
Maximum borrowing capacity, after possible increase   $ 300.0
Unused portion of the borrowing capacity fee percentage condition 50.00%  
Available borrowing capacity $ 37.2  
Amount outstanding 162.8  
Line of Credit Facility, Current Borrowing Capacity $ 200.0  
Minimum    
Long-term debt    
Commitment fee percentage on unused portion of the borrowing capacity 15.00%  
Maximum    
Long-term debt    
Commitment fee percentage on unused portion of the borrowing capacity 25.00%  
LIBOR | Minimum    
Long-term debt    
Margin added to variable rate basis (as a percent) 1.35%  
LIBOR | Maximum    
Long-term debt    
Margin added to variable rate basis (as a percent) 1.95%