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INDEBTEDNESS - Revolving Credit Facility, Narrative (Details) - Revolving Secured Credit Facility - Revolving Secured Credit Facility - USD ($)
1 Months Ended 12 Months Ended
Nov. 30, 2015
Dec. 31, 2019
Dec. 31, 2018
Debt Instrument [Line Items]      
Maximum borrowing capacity $ 375,000,000.0    
Annual administrative agent fee $ 100,000    
Unused commitment fee, percent 0.15%    
Remaining borrowing capacity   $ 375,000,000.0  
Unused commitment fees   $ 600,000 $ 600,000
Federal Funds Rate      
Debt Instrument [Line Items]      
Basis spread on variable rate 0.50%    
One-Month LIBOR | Minimum      
Debt Instrument [Line Items]      
Basis spread on variable rate 0.00%    
One-Month LIBOR | Maximum      
Debt Instrument [Line Items]      
Basis spread on variable rate 1.00%    
LIBOR | Minimum      
Debt Instrument [Line Items]      
Basis spread on variable rate 1.00%    
LIBOR | Maximum      
Debt Instrument [Line Items]      
Basis spread on variable rate 2.00%