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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% |

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- Definition Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing after the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-04.(a)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24072-122690 + Details
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