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Derivatives Volume of Activity (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2016 USD ($)
Derivative [Line Items] |  |
Beginning of Period Notional Amount | $ 9,680,000 |
Notional Amount of Derivative Instruments Added | 3,500,000 |
Notional Amount of Derivative Instruments Terminated | 9,300,000 |
End of Period Notional Amount | 3,880,000 |
Forward Contracts [Member] | Pay-fixed interest rate swap |  |
Derivative [Line Items] |  |
End of Period Notional Amount | 2,725,000 | [1]
Interest Rate Swap | Receive-fixed interest rate swap |  |
Derivative [Line Items] |  |
Beginning of Period Notional Amount | 425,000 |
Notional Amount of Derivative Instruments Added | 0 |
Notional Amount of Derivative Instruments Terminated | 0 |
End of Period Notional Amount | 425,000 |
Interest Rate Swap | Pay-fixed interest rate swap |  |
Derivative [Line Items] |  |
Beginning of Period Notional Amount | 2,955,000 |
Notional Amount of Derivative Instruments Added | 3,500,000 |
Notional Amount of Derivative Instruments Terminated | 3,000,000 |
End of Period Notional Amount | 3,455,000 | [1]
ERROR in label resolution. |  |
Derivative [Line Items] |  |
Beginning of Period Notional Amount | 6,300,000 |
Notional Amount of Derivative Instruments Added | 0 |
Notional Amount of Derivative Instruments Terminated | 6,300,000 |
End of Period Notional Amount | $ 0 |
[1] | The notional amount of pay-fixed interest rate swaps that were forward starting as of December 31, 2016 was $2,725,000.

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- Definition Aggregate notional amount terminated in the period specified by the derivative(s). Expressed as an absolute value. + References No definition available. + Details
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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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