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LOANS - Aggregate Positions in Capital Structure of Borrowers (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Schedule of Held-to-maturity Securities [Line Items]    
Corporate debt $ 2,185,264 $ 2,144,850
First lien loans    
Schedule of Held-to-maturity Securities [Line Items]    
Corporate debt 1,357,123 1,396,140
Second lien loans    
Schedule of Held-to-maturity Securities [Line Items]    
Corporate debt $ 828,141 $ 748,710