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(Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative assets, fair value |  | $ 2,940 |  |  |  |  | $ 28,534 |  |  |  | $ 2,940 |  | $ 28,534 |
Derivative liabilities, fair value |  | (269) |  |  |  |  | (6,922) |  |  |  | (269) |  | (6,922) |
Derivative asset, net of variation margin |  |  |  |  |  |  | 104 |  |  |  |  |  | 104 |
Derivative liability, net of variation margin |  |  |  |  |  |  | (576) |  |  |  |  |  | (576) |
Gain (loss) on derivative instruments, net |  | $ 12,678 |  | $ 5,993 | $ (15,802) | $ 175 | $ 56,546 | $ 2,409 | $ (16,297) | $ (48,264) | $ 3,044 |  | $ (5,606) | $ (43,128)
Derivative, Average Fixed Interest Rate, Current Effective |  | 1.36% |  |  |  |  | 0.73% |  |  |  | 1.36% |  | 0.73% |
Other Footnotes Disclosing Derivative-Related Information, Cross-Reference |  |  |  |  |  |  |  |  |  |  | Please refer to Note 1 for information related to the Company’s accounting policy for its derivative instruments. |  |  |
Forward starting interest rate swap |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative, Notional Amount |  | $ (2,525,000) |  |  |  |  | $ (2,725,000) |  |  |  | $ (2,525,000) |  | $ (2,725,000) |
Eurodollar futures |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative Instruments Not Designated as Hedging Instruments, Gain |  |  |  |  |  |  |  |  |  |  | (821) |  |  |
Derivative Instruments Not Designated as Hedging Instruments, Loss |  |  |  |  |  |  |  |  |  |  |  |  | (4,815) | (20,963)
Long [Member] | Interest rate swaps |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative Instruments Not Designated as Hedging Instruments, Gain |  |  |  |  |  |  |  |  |  |  | (23) |  | (2,515) | (6,522)
Long [Member] | TBA securities |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative assets, fair value |  |  |  |  |  |  | 0 |  |  |  |  |  | 0 |
Derivative Instruments Not Designated as Hedging Instruments, Gain |  |  |  |  |  |  |  |  |  |  | (5,757) |  | 0 | 0
Short [Member] | Interest rate swaps |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative Instruments Not Designated as Hedging Instruments, Loss |  |  |  |  |  |  |  |  |  |  | (2,655) |  | (3,306) | (28,687)
Short [Member] | TBA securities |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative Instruments Not Designated as Hedging Instruments, Gain |  |  |  |  |  |  |  |  |  |  |  |  | 0 | $ 0
Derivative Instruments Not Designated as Hedging Instruments, Loss |  |  |  |  |  |  |  |  |  |  | (902) |  |  |
Not Designated as Hedging Instrument, Economic Hedge [Member] | Interest rate swaps |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative assets, fair value | [1] | 791 |  |  |  |  | 28,534 |  |  |  | 791 |  | 28,534 |
Derivative liabilities, fair value | [1] | 0 |  |  |  |  | (6,922) |  |  |  | 0 |  | (6,922) |
Derivative, Notional Amount | [2] | $ (5,675,000) |  |  |  |  | $ (3,030,000) |  |  |  | $ (5,675,000) |  | $ (3,030,000) |
Derivative, Average Fixed Interest Rate | [3] | 1.71% |  |  |  |  | 1.58% |  |  |  | 1.71% |  | 1.58% |
Derivative, Average Remaining Maturity |  |  |  |  |  |  |  |  |  |  | 3 years 1 month 6 days |  | 5 years 3 months 18 days |
Derivative, Fair Value, Net |  | $ 791 |  |  |  |  | $ 21,612 |  |  |  | $ 791 |  | $ 21,612 |
Not Designated as Hedging Instrument, Economic Hedge [Member] | Eurodollar futures |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative assets, fair value |  | 666 | [1] |  |  |  | 0 |  |  |  | 666 | [1] | 0 |
Derivative, Notional Amount |  | (1,950,000) |  |  |  |  | 0 |  |  |  | (1,950,000) |  | 0 |
Notional Amount of Derivative Instruments Added |  |  |  |  |  |  |  |  |  |  | 2,600,000 |  |  |
Notional Amount of Derivative Instruments Maturing, Settled, Terminated, or Paired-Off |  |  |  |  |  |  |  |  |  |  | 650,000 |  |  |
Not Designated as Hedging Instrument, Economic Hedge [Member] | Long [Member] | Interest rate swaps |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative, Notional Amount |  | (100,000) |  |  |  |  | (425,000) |  |  |  | (100,000) |  | (425,000) |
Notional Amount of Derivative Instruments Added |  |  |  |  |  |  |  |  |  |  | 0 |  |  |
Notional Amount of Derivative Instruments Maturing, Settled, Terminated, or Paired-Off |  |  |  |  |  |  |  |  |  |  | 325,000 |  |  |
Not Designated as Hedging Instrument, Economic Hedge [Member] | Short [Member] | Interest rate swaps |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative, Notional Amount |  | (5,775,000) |  |  |  |  | (3,455,000) |  |  |  | (5,775,000) |  | (3,455,000) |
Notional Amount of Derivative Instruments Added |  |  |  |  |  |  |  |  |  |  | 3,890,000 |  |  |
Notional Amount of Derivative Instruments Maturing, Settled, Terminated, or Paired-Off |  |  |  |  |  |  |  |  |  |  | 1,570,000 |  |  |
Not Designated as Hedging Instrument, Economic Hedge [Member] | Short [Member] | TBA securities |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative liabilities, fair value |  | (269) |  |  |  |  | 0 |  |  |  | (269) |  | 0 |
Derivative, Notional Amount |  | (150,000) | [4] |  |  |  | 0 |  |  |  | (150,000) | [4] | 0 |
Notional Amount of Derivative Instruments Added |  |  |  |  |  |  |  |  |  |  | 250,000 |  |  |
Notional Amount of Derivative Instruments Maturing, Settled, Terminated, or Paired-Off |  |  |  |  |  |  |  |  |  |  | 100,000 |  |  |
Not Designated as Hedging Instrument, Trading [Member] | Long [Member] | TBA securities |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative assets, fair value |  | 1,483 |  |  |  |  |  |  |  |  | 1,483 |  |  |
Derivative, Notional Amount |  | (795,000) | [4] |  |  |  | 0 |  |  |  | (795,000) | [4] | 0 |
Notional Amount of Derivative Instruments Added |  |  |  |  |  |  |  |  |  |  | 6,729,000 |  |  |
Notional Amount of Derivative Instruments Maturing, Settled, Terminated, or Paired-Off |  |  |  |  |  |  |  |  |  |  | 5,934,000 |  |  |
Maturity in three years or less | Not Designated as Hedging Instrument, Economic Hedge [Member] | Interest rate swaps |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative, Notional Amount | [2] | $ (3,320,000) |  |  |  |  | $ (595,000) |  |  |  | $ (3,320,000) |  | $ (595,000) |
Derivative, Average Fixed Interest Rate |  | 1.35% |  |  |  |  | 0.73% |  |  |  | 1.35% |  | 0.73% |
Derivative, Average Remaining Maturity |  |  |  |  |  |  |  |  |  |  | 8 months 12 days |  | 2 years 3 months 18 days |
Derivative, Fair Value, Net |  | $ 791 |  |  |  |  | $ 4,348 |  |  |  | $ 791 |  | $ 4,348 |
Maturity between 3 and 6 years | Not Designated as Hedging Instrument, Economic Hedge [Member] | Interest rate swaps |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative, Notional Amount | [2] | $ (1,210,000) |  |  |  |  | $ (1,185,000) |  |  |  | $ (1,210,000) |  | $ (1,185,000) |
Derivative, Average Fixed Interest Rate |  | 2.00% |  |  |  |  | 1.47% |  |  |  | 2.00% |  | 1.47% |
Derivative, Average Remaining Maturity |  |  |  |  |  |  |  |  |  |  | 4 years 7 months 6 days |  | 4 years 3 months 18 days |
Derivative, Fair Value, Net |  | $ 0 |  |  |  |  | $ 8,631 |  |  |  | $ 0 |  | $ 8,631 |
Maturity between 6 and 10 years | Not Designated as Hedging Instrument, Economic Hedge [Member] | Interest rate swaps |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative, Notional Amount | [2] | $ (1,025,000) |  |  |  |  | $ (1,250,000) |  |  |  | $ (1,025,000) |  | $ (1,250,000) |
Derivative, Average Fixed Interest Rate |  | 2.49% |  |  |  |  | 2.42% |  |  |  | 2.49% |  | 2.42% |
Derivative, Average Remaining Maturity |  |  |  |  |  |  |  |  |  |  | 8 years |  | 8 years 10 months 24 days |
Derivative, Fair Value, Net |  | $ 0 |  |  |  |  | $ 8,633 |  |  |  | $ 0 |  | $ 8,633 |
Maturity greater than 10 years [Member] | Not Designated as Hedging Instrument, Economic Hedge [Member] | Interest rate swaps |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative, Notional Amount | [2] | $ (120,000) |  |  |  |  |  |  |  |  | $ (120,000) |  |  |
Derivative, Average Fixed Interest Rate |  | 2.75% |  |  |  |  |  |  |  |  | 2.75% |  |  |
Derivative, Average Remaining Maturity |  |  |  |  |  |  |  |  |  |  | 17 years 3 months 18 days |  |  |
Derivative, Fair Value, Net |  | $ 0 |  |  |  |  |  |  |  |  | $ 0 |  |  |
[1] | Refer to Note 1 regarding information on a change in the CME rulebook. Amounts reported on the consolidated balance sheet as of December 31, 2017 for its interest rate swaps reflect the netting of the derivative asset or liability with the related collateral received or posted, respectively. The net amounts comparable to December 31, 2017 for the derivative asset and derivative liabilities as of December 31, 2016 were $104 and $(576), respectively.
[2] | The net notional amounts included in the tables above represent pay-fixed interest rate swaps, net of receive-fixed interest rate swaps and include $2,525,000 and $2,725,000 of pay-fixed forward starting interest rate swaps as of December 31, 2017 and December 31, 2016, respectively.
[3] | Excluding forward starting pay-fixed interest rate swaps, the weighted average pay rate was 1.36% and 0.73% as of December 31, 2017 and December 31, 2016, respectively.
[4] | Notional amount represents the par value (or principal balance) of the underlying Agency MBS as if settled as of the end of the period.

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- Definition Represents the unsettled fair value of derivative asset net of variation margin received. Beginning in 2017, the Company accounts for the daily exchange of variation margin associated with its Chicago Mercantile Exchange cleared interest rate swaps as a direct increase or decrease to the carrying value of the related derivative asset or liability. This netting is the result of changes made in January 2017 to CME's rulebook which now consider the exchange of variation margin to be legally considered as settlement of the derivative itself as opposed to pledge of collateral. + References No definition available. + Details
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