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Debt - Cabot Senior Revolving Credit Facility (Details)
$ in Thousands
12 Months Ended
Nov. 11, 2015
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2018
GBP (£)
Sep. 30, 2018
GBP (£)
Debt Instrument [Line Items]          
Weighted average interest rate   5.01% 4.03%    
Cabot senior revolving credit facility          
Debt Instrument [Line Items]          
Revolving credit facility       £ 385,000,000.0  
Maximum loan to value ratio   0.75%      
Outstanding borrowings for credit facility | $   $ 298,005 $ 179,008    
Weighted average interest rate   3.73% 3.60%    
Available capacity   $ 192,400   151,100,000  
Senior Loans | Cabot senior revolving credit facility          
Debt Instrument [Line Items]          
Maximum loan to value ratio   27.50%      
Maximum utilization of credit facility   20.00%      
LIBOR | Cabot senior revolving credit facility          
Debt Instrument [Line Items]          
Debt instrument, alternate basis spread on variable rate 2.75%        
LIBOR | Secured Debt | Cabot senior revolving credit facility          
Debt Instrument [Line Items]          
Debt instrument, initial spread percentage   3.00%      
Maximum utilization of credit facility   20.00%      
Cabot Credit Agreement, Tranche with Expiration in September 2022 | Secured Debt | Cabot senior revolving credit facility          
Debt Instrument [Line Items]          
Revolving credit facility       £ 375,000,000.0  
Cabot Credit Agreement, Tranche with Expiration in September 2021 | Secured Debt | Cabot senior revolving credit facility          
Debt Instrument [Line Items]          
Revolving credit facility         £ 10,000,000.0