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Debt Obligations - Bank Borrowings Terms (Details)
12 Months Ended
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Debt Obligations    
Maximum available under facility $ 1,000,000,000 $ 600,000,000
Additional extension period option 1 year  
Unused commitment fee (as a percent) 20.00%  
LIBOR    
Debt Obligations    
Basis spread over base rate (as a percent) 115.00%  
Bank Borrowings    
Financial covenants    
Maximum ratio of total indebtedness to total asset value 0.5  
Maximum ratio of secured debt to total asset value 0.35  
Maximum ratio of unsecured debt to the value of the unencumbered asset pool 0.6  
Minimum ratio of EBITDA to fixed charges 1.50  
Private Shelf Agreement Prudential | Senior Unsecured Notes    
Debt Obligations    
Maximum available under facility $ 337,500,000  
Availability $ 21,500,000