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Borrowings - Cabot Senior Revolving Credit Facility - Narrative (Details) - Cabot credit facility
$ in Thousands
3 Months Ended
Mar. 31, 2020
GBP (£)
Mar. 31, 2019
Mar. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Debt Instrument [Line Items]        
Revolving credit facility £ 375,000,000.0      
Maximum loan to value ratio 75.00%      
Credit facility, outstanding amount £ 194,000,000.0   $ 241,200 $ 285,749
Weighted average interest rate (as a percent) 3.55% 3.37%    
Remaining borrowing capacity £ 181,000,000.0   $ 225,000  
Secured Debt | Cabot Credit Agreement, Tranche with Expiration in September 2022 | LIBOR        
Debt Instrument [Line Items]        
Basis spread on variable rate (as a percent) 3.00%      
Senior Loans        
Debt Instrument [Line Items]        
Maximum loan to value ratio 27.50%