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Notes Payable - Callable Medium-Term Notes (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Debt Instrument [Line Items] |  |
Long-term Debt, Maturities, Repayments of Principal in Year Two | $ 2,644,734 | $ 1,733,121
Long-term Debt, Weighted Average Interest Rate, at Point in Time | 1.91% | 1.68%
Long-term Debt, Maturities, Repayments of Principal in Year Three | $ 1,842,143 | $ 1,283,869
Long-term Debt, Maturities, Repayments of Principal in Year Four | 849,263 | 495,096
Long-term Debt, Maturities, Repayments of Principal in Year Five | 790,564 | 602,037
Long-term Debt, Maturities, Repayments of Principal after Year Five | 1,306,086 | 1,108,854
Due after one year | 7,432,790 | 5,222,977
Notes Payable to Banks [Member] |  |
Debt Instrument [Line Items] |  |
Short-term Debt, Maximum Month-end Outstanding Amount | 3,300,000 | $ 6,900,000
Call Option [Member] |  |
Debt Instrument [Line Items] |  |
Long-term Debt, Maturities, Repayments of Principal in Year Two | $ 71,944 |
Long-term Debt, Weighted Average Interest Rate, at Point in Time | 2.09% |
Long-term Debt, Maturities, Repayments of Principal in Year Three | $ 158,817 |
Long-term Debt, Maturities, Repayments of Principal in Year Four | 192,717 |
Long-term Debt, Maturities, Repayments of Principal in Year Five | 145,757 |
Long-term Debt, Maturities, Repayments of Principal after Year Five | 178,267 |
Due after one year | $ 747,502 |
Due year two [Member] | Call Option [Member] |  |
Debt Instrument [Line Items] |  |
Long-term Debt, Weighted Average Interest Rate, at Point in Time | 1.35% |
Due year three [Member] | Call Option [Member] |  |
Debt Instrument [Line Items] |  |
Long-term Debt, Weighted Average Interest Rate, at Point in Time | 1.80% |
Due year four [Member] | Call Option [Member] |  |
Debt Instrument [Line Items] |  |
Long-term Debt, Weighted Average Interest Rate, at Point in Time | 1.77% |
Due year five [Member] | Call Option [Member] |  |
Debt Instrument [Line Items] |  |
Long-term Debt, Weighted Average Interest Rate, at Point in Time | 2.20% |
Due after five years [Member] | Call Option [Member] |  |
Debt Instrument [Line Items] |  |
Long-term Debt, Weighted Average Interest Rate, at Point in Time | 2.90% |

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