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Derivatives Volume of Activity (Details) $ in Thousands | 6 Months Ended
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Jun. 30, 2017 USD ($)
Derivative [Line Items] |  |
Beginning of Period Notional Amount | $ 3,030,000 | [1]
End of Period Notional Amount | 5,285,000 | [1]
TBA security |  |
Derivative [Line Items] |  |
Beginning of Period Notional Amount | 0 |
Notional Amount of Derivative Instruments Added | 1,300,000 |
Notional Amount of Derivative Instruments Maturing, Settled, Terminated, or Paired-Off | (900,000) |
End of Period Notional Amount | 400,000 | [2]
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 Maturing, Settled, Terminated, or Paired-Off | (325,000) |
End of Period Notional Amount | 100,000 |
Interest Rate Swap | Pay-fixed interest rate swap |  |
Derivative [Line Items] |  |
Beginning of Period Notional Amount | 3,455,000 |
Notional Amount of Derivative Instruments Added | 2,750,000 |
Notional Amount of Derivative Instruments Maturing, Settled, Terminated, or Paired-Off | (820,000) |
End of Period Notional Amount | $ 5,385,000 |
[1] | The net notional amounts included in the tables above represent pay-fixed interest rate swaps, net of receive-fixed interest rate swaps and include $2,425,000 and $2,725,000 of pay-fixed forward starting interest rate swaps as of June 30, 2017 and December 31, 2016, respectively.
[2] | Notional amount represents the par value (or principal balance) of the underlying Agency MBS.

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