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Credit Facility - Narrative (Details)
1 Months Ended 9 Months Ended
Oct. 31, 2018
USD ($)
Sep. 30, 2019
USD ($)
extension
Sep. 30, 2018
currency
Dec. 31, 2018
USD ($)
Credit facility        
Credit facility origination costs   $ 12,339,000   $ 14,248,000
Outstanding balance   0   252,000,000
Unsecured debt | Revolving Credit Facility        
Credit facility        
Maximum borrowing capacity   $ 3,000,000,000.0    
Number of extensions | extension   2    
Term of extension option   6 months    
Number of currencies allowable per facility | currency     14  
Accordion expansion option   $ 1,000,000,000.0    
Outstanding balance   0   $ 252,000,000.0
Current borrowing capacity   $ 3,000,000,000.0    
Weighted average borrowing rate during the period (as a percent)   3.20% 2.80%  
Weighted average interest rate at the end of the period (as a percent)       3.20%
Unsecured debt | Revolving Credit Facility | Other assets, net        
Credit facility        
Credit facility origination costs   $ 12,300,000   $ 14,200,000
Unsecured debt | Revolving Credit Facility | LIBOR        
Credit facility        
Basis spread on variable rate (as a percent)   0.775%    
Commitment fee (as a percent)   0.125%    
All-in drawn variable interest rate (as a percent)   0.90%    
Term Loans | $250 million senior unsecured term loan due March 2024        
Credit facility        
Face amount of loan $ 250,000,000.0 $ 250,000,000.0    
Basis spread on variable rate (as a percent) 0.85%