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Notes Payable - Callable Medium-Term Notes (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Debt Instrument [Line Items]    
Two years $ 3,381,965 $ 3,700,835
Three years 1,588,751 1,594,709
Four years 1,311,362 1,205,276
Five years 1,027,532 760,887
Thereafter 2,207,226 1,817,859
Total $ 20,665,020 $ 19,098,648
Weighted - Average Rate (as a percent) 2.00% 2.28%
Call Option    
Debt Instrument [Line Items]    
Two years $ 731,715  
Three years 209,852  
Four years 49,959  
Five years 206,716  
Thereafter 397,740  
Total $ 1,595,982  
Weighted - Average Rate (as a percent) 1.91%  
Call Option | 2021    
Debt Instrument [Line Items]    
Weighted - Average Rate (as a percent) 1.56%  
Call Option | 2022    
Debt Instrument [Line Items]    
Weighted - Average Rate (as a percent) 1.80%  
Call Option | 2023    
Debt Instrument [Line Items]    
Weighted - Average Rate (as a percent) 1.34%  
Call Option | 2024    
Debt Instrument [Line Items]    
Weighted - Average Rate (as a percent) 2.12%  
Call Option | Thereafter    
Debt Instrument [Line Items]    
Weighted - Average Rate (as a percent) 2.59%