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Debt, Net - Cabot Senior Revolving Credit Facility - Narrative (Details) - Cabot credit facility
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
USD ($)
Jun. 30, 2018
Jun. 30, 2019
USD ($)
Jun. 30, 2018
Jun. 30, 2019
GBP (£)
Dec. 31, 2018
USD ($)
Debt Instrument [Line Items]            
Revolving credit facility         £ 385,000,000.0  
Maximum loan to value ratio     0.75%      
Credit facility, outstanding amount $ 291,400   $ 291,400   229,500,000 $ 298,005
Weighted average interest rate (as a percent) 3.36% 3.68% 3.36% 3.72%    
Remaining borrowing capacity $ 197,500   $ 197,500   155,500,000  
Secured Debt | LIBOR            
Debt Instrument [Line Items]            
Loan-to-value credit facility utilization trigger (more than)     20.00%      
Secured Debt | Cabot Credit Agreement, Tranche with Expiration in September 2022            
Debt Instrument [Line Items]            
Revolving credit facility         375,000,000.0  
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%      
Secured Debt | Tranche with Expiration in September 2021            
Debt Instrument [Line Items]            
Revolving credit facility         £ 10,000,000.0  
Secured Debt | Tranche with Expiration in September 2021 | LIBOR            
Debt Instrument [Line Items]            
Basis spread on variable rate (as a percent)     3.25%      
Senior Loans            
Debt Instrument [Line Items]            
Maximum loan to value ratio     27.50%