v3.19.3
INDEBTEDNESS - Revolving Credit Facility Narrative (Details) - Revolving Credit Facility - Line of Credit - USD ($)
1 Months Ended 3 Months Ended 9 Months Ended
Nov. 30, 2015
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Debt Instrument [Line Items]          
Maximum borrowing capacity $ 375,000,000.0        
Administrative agent fee $ 100,000        
Unused commitment fee percentage 0.15%        
Amounts drawn to date   $ 0   $ 0  
Remaining borrowing capacity   375,000,000.0   375,000,000.0  
Unused commitment fees   $ 100,000 $ 400,000 $ 100,000 $ 400,000
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%