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Notes Payable - Unsecured Senior Notes (Details) - Senior Notes, Unsecured
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
USD ($)
tranche
Dec. 31, 2017
USD ($)
tranche
Debt Instrument [Line Items]      
Debt amount     $ 350,000,000
Number of tranches | tranche     2
Fixed charge coverage ratio 1.50    
Minimum      
Debt Instrument [Line Items]      
Unencumbered interest coverage ratio 1.75    
Maximum      
Debt Instrument [Line Items]      
Leverage ratio (percent) 60.00%    
Secured leverage ratio (percent) 40.00%    
3.78% Senior Notes, Unsecured      
Debt Instrument [Line Items]      
Interest rate 3.78%    
3.86% Senior Notes, Unsecured      
Debt Instrument [Line Items]      
Interest rate 3.86%    
3.95% Senior Notes, Unsecured      
Debt Instrument [Line Items]      
Interest rate 3.95%    
4.09% Senior Notes, Unsecured      
Debt Instrument [Line Items]      
Debt amount     $ 100,000,000
Interest rate 4.09%   4.09%
3.91% Senior Notes, Unsecured      
Debt Instrument [Line Items]      
Debt amount     $ 250,000,000
Interest rate 3.91%   3.91%
Private Placement      
Debt Instrument [Line Items]      
Debt amount   $ 650,000,000  
Number of tranches | tranche   3  
Private Placement | 3.78% Senior Notes, Unsecured      
Debt Instrument [Line Items]      
Debt amount   $ 125,000,000  
Interest rate   3.78%  
Private Placement | 3.86% Senior Notes, Unsecured      
Debt Instrument [Line Items]      
Debt amount   $ 250,000,000  
Interest rate   3.86%  
Private Placement | 3.95% Senior Notes, Unsecured      
Debt Instrument [Line Items]      
Debt amount   $ 275,000,000  
Interest rate   3.95%