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Debt, Net - Cabot Senior Revolving Credit Facility - Narrative (Details) - Cabot credit facility
3 Months Ended 6 Months Ended
Jun. 30, 2018
USD ($)
Jun. 30, 2017
Jun. 30, 2018
USD ($)
Jun. 30, 2017
Jun. 30, 2018
GBP (£)
Dec. 31, 2017
USD ($)
Dec. 12, 2017
USD ($)
Dec. 12, 2017
GBP (£)
Debt Instrument [Line Items]                
Revolving credit facility             $ 395,200,000.0 £ 295,000,000
Maximum loan to value ratio     75.00%          
Credit facility, outstanding amount | $ $ 243,900,000   $ 243,900,000     $ 179,008,000    
Weighted average interest rate (as a percent) 3.68% 3.50% 3.72% 3.51%        
Secured Debt                
Debt Instrument [Line Items]                
Loan-to-value credit facility utilization trigger (more than)     20.00%          
Secured Debt | LIBOR                
Debt Instrument [Line Items]                
Basis spread on variable rate (as a percent)     3.25%          
Debt Instrument, Basis Spread On Variable Rate Upon Meeting Specified Conditions     2.75%          
Secured Debt | Tranche with Expiration in September 2021                
Debt Instrument [Line Items]                
Revolving credit facility         £ 245,000,000.0      
Secured Debt | Tranche with Expiration in March 2022                
Debt Instrument [Line Items]                
Revolving credit facility         £ 50,000,000.0      
Senior Loans                
Debt Instrument [Line Items]                
Maximum loan to value ratio     27.50%          
Loan-to-value credit facility utilization trigger (more than)     20.00%