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SUBSEQUENT EVENTS - Credit Facility (Details) - Credit Facility - USD ($)
$ in Millions
Feb. 28, 2019
Dec. 31, 2018
Subsequent Event [Line Items]    
Amount outstanding   $ 120.7
Available borrowing capacity   $ 29.3
Subsequent Event    
Subsequent Event [Line Items]    
Repayments of Credit Facility $ 23.0  
Amount outstanding 97.7  
Available borrowing capacity $ 46.3