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Debt Obligations - Bank Borrowings Terms (Details) - Bank Borrowings
12 Months Ended
Dec. 31, 2020
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%  
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  
LIBOR    
Debt Obligations    
Basis spread over base rate (as a percent) 115.00%