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Notes Payable - Callable Medium-Term Notes (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Debt Instrument [Line Items]    
Long-term Debt, Maturities, Repayments of Principal in Year Two $ 1,733,121 $ 1,200,558
Long-term Debt, Weighted Average Interest Rate 1.68% 1.59%
Long-term Debt, Maturities, Repayments of Principal in Year Three $ 1,283,869 $ 1,539,264
Long-term Debt, Maturities, Repayments of Principal in Year Four 495,096 520,284
Long-term Debt, Maturities, Repayments of Principal in Year Five 602,037 529,567
Long-term Debt, Maturities, Repayments of Principal after Year Five 1,108,854 1,177,363
Due after one year 5,222,977 $ 4,967,036
Call Option [Member]    
Debt Instrument [Line Items]    
Long-term Debt, Maturities, Repayments of Principal in Year Two $ 9,991  
Long-term Debt, Weighted Average Interest Rate 1.90%  
Long-term Debt, Maturities, Repayments of Principal in Year Three $ 61,922  
Long-term Debt, Maturities, Repayments of Principal in Year Four 30,961  
Long-term Debt, Maturities, Repayments of Principal in Year Five 148,726  
Long-term Debt, Maturities, Repayments of Principal after Year Five 91,714  
Due after one year $ 343,314  
Due year two [Member] | Call Option [Member]    
Debt Instrument [Line Items]    
Long-term Debt, Weighted Average Interest Rate 1.24%  
Due year three [Member] | Call Option [Member]    
Debt Instrument [Line Items]    
Long-term Debt, Weighted Average Interest Rate 1.31%  
Due year four [Member] | Call Option [Member]    
Debt Instrument [Line Items]    
Long-term Debt, Weighted Average Interest Rate 1.83%  
Due year five [Member] | Call Option [Member]    
Debt Instrument [Line Items]    
Long-term Debt, Weighted Average Interest Rate 1.72%  
Due after five years [Member] | Call Option [Member]    
Debt Instrument [Line Items]    
Long-term Debt, Weighted Average Interest Rate 2.69%