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Notes Payable - Callable Medium-Term Notes (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Debt Instrument [Line Items]    
Long-term Debt, Maturities, Repayments of Principal in Year Two $ 3,090,405 $ 2,644,734
Long-term Debt, Weighted Average Interest Rate, at Point in Time 2.48% 1.91%
Due after one year $ 8,486,647 $ 7,432,790
Long-term Debt, Maturities, Repayments of Principal after Year Five 1,434,383 1,306,086
Long-term Debt, Maturities, Repayments of Principal in Year Five 881,738 790,564
Long-term Debt, Maturities, Repayments of Principal in Year Four 859,470 849,263
Long-term Debt, Maturities, Repayments of Principal in Year Three 2,220,651 1,842,143
Call Option [Member]    
Debt Instrument [Line Items]    
Long-term Debt, Maturities, Repayments of Principal in Year Two $ 239,327  
Long-term Debt, Weighted Average Interest Rate, at Point in Time 2.66%  
Due after one year $ 1,363,244  
Long-term Debt, Maturities, Repayments of Principal after Year Five 294,720  
Long-term Debt, Maturities, Repayments of Principal in Year Five 253,758  
Long-term Debt, Maturities, Repayments of Principal in Year Four 165,810  
Long-term Debt, Maturities, Repayments of Principal in Year Three 409,629  
Notes Payable to Banks [Member]    
Debt Instrument [Line Items]    
Short-term Debt, Maximum Month-end Outstanding Amount $ 1,600,000 $ 3,300,000
Due year two [Member] | Call Option [Member]    
Debt Instrument [Line Items]    
Long-term Debt, Weighted Average Interest Rate, at Point in Time 2.13%  
Due year three [Member] | Call Option [Member]    
Debt Instrument [Line Items]    
Long-term Debt, Weighted Average Interest Rate, at Point in Time 2.38%  
Due year four [Member] | Call Option [Member]    
Debt Instrument [Line Items]    
Long-term Debt, Weighted Average Interest Rate, at Point in Time 2.31%  
Due year five [Member] | Call Option [Member]    
Debt Instrument [Line Items]    
Long-term Debt, Weighted Average Interest Rate, at Point in Time 3.14%  
Due after five years [Member] | Call Option [Member]    
Debt Instrument [Line Items]    
Long-term Debt, Weighted Average Interest Rate, at Point in Time 3.27%