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Derivatives (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014 | Dec. 31, 2014
Derivative [Line Items] |  |  |  |  |  |  |  |
Derivative assets, fair value |  |  |  |  |  |  | $ 5,727 |
Derivative assets, aggregate notional amount | $ 375,000 |  |  | $ 375,000 |  |  | 440,000 |
Derivative liabilities, fair value | (63,708) |  |  | (63,708) |  |  | (35,898) |
Derivative liabilities, aggregate notional amount | 9,265,000 |  |  | 9,265,000 |  |  | 17,085,000 |
Derivative assets | 10,057 |  |  | 10,057 |  |  | 5,727 |
Beginning of period notional amount |  |  |  | 17,525,000 |  |  |  |
Notional Amount of Derivative Instruments Added |  |  |  | 3,135,000 |  |  |  |
Notional Amount of Derivative Instruments Terminated |  |  |  | (11,020,000) |  |  |  |
End of period notional amount | 9,640,000 |  |  | 9,640,000 |  |  |  |
(Loss) gain on derivative instruments, net | (52,749) |  | $ 4,842 | (60,982) |  | $ (31,654) |  |
Forward Contracts [Member] |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
End of period notional amount | $ 1,675,000 |  |  | $ 1,675,000 |  |  |  |
Weighted-average Fixed Pay Rate | 1.38% |  |  | 1.38% |  |  |  |
Weighted-average Fixed Receive Rate | 1.38% |  |  | 1.38% |  |  |  |
Interest Rate Swap [Member] |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Derivative assets, fair value | $ 10,057 |  |  | $ 10,057 |  |  | 5,727 |
Derivative assets, aggregate notional amount | 375,000 |  |  | 375,000 |  |  | 440,000 |
Derivative liabilities, fair value | (30,632) |  |  | (30,632) |  |  | (3,002) |
Derivative liabilities, aggregate notional amount | 2,965,000 |  |  | 2,965,000 |  |  | 485,000 |
Eurodollar Future [Member] |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Derivative assets, fair value | 0 |  |  | 0 |  |  | 0 |
Derivative assets, aggregate notional amount | 0 | [1] |  | 0 | [1] |  | 0 | [2]
Derivative liabilities, fair value | (33,076) |  |  | (33,076) |  |  | (32,896) |
Derivative liabilities, aggregate notional amount | 6,300,000 | [1] |  | 6,300,000 | [1] |  | $ 16,600,000 | [2]
Beginning of period notional amount |  |  |  | 16,600,000 |  |  |  |
Notional Amount of Derivative Instruments Added |  |  |  | 0 |  |  |  |
Notional Amount of Derivative Instruments Terminated |  |  |  | (10,300,000) |  |  |  |
End of period notional amount | 6,300,000 |  |  | 6,300,000 |  |  |  |
(Loss) gain on derivative instruments, net | (11,027) |  | 3,857 | (24,942) |  | (11,937) |  |
Receive-fixed interest rate swap [Member] | Interest Rate Swap [Member] |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Beginning of period notional amount |  |  |  | 275,000 |  |  |  |
Notional Amount of Derivative Instruments Added |  |  |  | 50,000 |  |  |  |
Notional Amount of Derivative Instruments Terminated |  |  |  | 0 |  |  |  |
End of period notional amount | 325,000 |  |  | 325,000 |  |  |  |
(Loss) gain on derivative instruments, net | 6,975 |  | 339 | 9,757 |  | 339 |  |
Receive-fixed interest rate swap [Member] | Interest Rate Swap [Member] | Interest Rate Swap Agreements, Maturities in Next 13-24 Months [Member] |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
End of period notional amount | $ 0 |  |  | $ 0 |  |  |  |
Weighted-average Fixed Pay Rate | 0.00% |  |  | 0.00% |  |  |  |
Weighted-average Fixed Receive Rate | 0.00% |  |  | 0.00% |  |  |  |
Receive-fixed interest rate swap [Member] | Interest Rate Swap [Member] | Interest Rate Swap Agreements, Maturities in Next 37-48 Months [Member] |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
End of period notional amount | $ 250,000 |  |  | $ 250,000 |  |  |  |
Weighted-average Fixed Pay Rate | 1.14% |  |  | 1.14% |  |  |  |
Weighted-average Fixed Receive Rate | 1.14% |  |  | 1.14% |  |  |  |
Receive-fixed interest rate swap [Member] | Interest Rate Swap [Member] | Interest Rate Swap Agreements, Maturities in Next 49-60 Months [Member] |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
End of period notional amount | $ 50,000 |  |  | $ 50,000 |  |  |  |
Weighted-average Fixed Pay Rate | 1.75% |  |  | 1.75% |  |  |  |
Weighted-average Fixed Receive Rate | 1.75% |  |  | 1.75% |  |  |  |
Receive-fixed interest rate swap [Member] | Interest Rate Swap [Member] | Interest Rate Swap Agreements, Maturities in Next 73-84 Months [Member] |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
End of period notional amount | $ 0 |  |  | $ 0 |  |  |  |
Weighted-average Fixed Pay Rate | 0.00% |  |  | 0.00% |  |  |  |
Weighted-average Fixed Receive Rate | 0.00% |  |  | 0.00% |  |  |  |
Receive-fixed interest rate swap [Member] | Interest Rate Swap [Member] | Interest Rate Swap Agreements, Maturities in Next 85-96 Months [Member] |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
End of period notional amount | $ 0 |  |  | $ 0 |  |  |  |
Weighted-average Fixed Pay Rate | 0.00% |  |  | 0.00% |  |  |  |
Weighted-average Fixed Receive Rate | 0.00% |  |  | 0.00% |  |  |  |
Receive-fixed interest rate swap [Member] | Interest Rate Swap [Member] | Interest Rate Swap Agreements, Maturities in Next 97-108 Months [Member] |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
End of period notional amount | $ 25,000 |  |  | $ 25,000 |  |  |  |
Weighted-average Fixed Pay Rate | 2.71% |  |  | 2.71% |  |  |  |
Weighted-average Fixed Receive Rate | 2.71% |  |  | 2.71% |  |  |  |
Receive-fixed interest rate swap [Member] | Interest Rate Swap [Member] | Interest Rate Swap Agreements, Maturities in Next 109-120 Months [Member] |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
End of period notional amount | $ 0 |  |  | $ 0 |  |  |  |
Weighted-average Fixed Pay Rate | 0.00% |  |  | 0.00% |  |  |  |
Weighted-average Fixed Receive Rate | 0.00% |  |  | 0.00% |  |  |  |
Pay-fixed interest rate swap [Member] | Interest Rate Swap [Member] |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Beginning of period notional amount |  |  |  | $ 650,000 |  |  |  |
Notional Amount of Derivative Instruments Added |  |  |  | 3,085,000 |  |  |  |
Notional Amount of Derivative Instruments Terminated |  |  |  | (720,000) |  |  |  |
End of period notional amount | $ 3,015,000 |  |  | 3,015,000 |  |  |  |
(Loss) gain on derivative instruments, net | (48,697) |  | $ 646 | (45,797) |  | $ (20,056) |  |
Pay-fixed interest rate swap [Member] | Interest Rate Swap [Member] | Interest Rate Swap Agreements, Maturities in Next 13-24 Months [Member] |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
End of period notional amount | $ 1,435,000 |  |  | $ 1,435,000 |  |  |  |
Weighted-average Fixed Pay Rate | 1.18% |  |  | 1.18% |  |  |  |
Weighted-average Fixed Receive Rate | 1.18% |  |  | 1.18% |  |  |  |
Pay-fixed interest rate swap [Member] | Interest Rate Swap [Member] | Interest Rate Swap Agreements, Maturities in Next 37-48 Months [Member] |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
End of period notional amount | $ 160,000 |  |  | $ 160,000 |  |  |  |
Weighted-average Fixed Pay Rate | 1.37% |  |  | 1.37% |  |  |  |
Weighted-average Fixed Receive Rate | 1.37% |  |  | 1.37% |  |  |  |
Pay-fixed interest rate swap [Member] | Interest Rate Swap [Member] | Interest Rate Swap Agreements, Maturities in Next 49-60 Months [Member] |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
End of period notional amount | $ 635,000 |  |  | $ 635,000 |  |  |  |
Weighted-average Fixed Pay Rate | 1.74% |  |  | 1.74% |  |  |  |
Weighted-average Fixed Receive Rate | 1.74% |  |  | 1.74% |  |  |  |
Pay-fixed interest rate swap [Member] | Interest Rate Swap [Member] | Interest Rate Swap Agreements, Maturities in Next 73-84 Months [Member] |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
End of period notional amount | $ 75,000 |  |  | $ 75,000 |  |  |  |
Weighted-average Fixed Pay Rate | 1.77% |  |  | 1.77% |  |  |  |
Weighted-average Fixed Receive Rate | 1.77% |  |  | 1.77% |  |  |  |
Pay-fixed interest rate swap [Member] | Interest Rate Swap [Member] | Interest Rate Swap Agreements, Maturities in Next 85-96 Months [Member] |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
End of period notional amount | $ 125,000 |  |  | $ 125,000 |  |  |  |
Weighted-average Fixed Pay Rate | 1.98% |  |  | 1.98% |  |  |  |
Weighted-average Fixed Receive Rate | 1.98% |  |  | 1.98% |  |  |  |
Pay-fixed interest rate swap [Member] | Interest Rate Swap [Member] | Interest Rate Swap Agreements, Maturities in Next 97-108 Months [Member] |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
End of period notional amount | $ 0 |  |  | $ 0 |  |  |  |
Weighted-average Fixed Pay Rate | 0.00% |  |  | 0.00% |  |  |  |
Weighted-average Fixed Receive Rate | 0.00% |  |  | 0.00% |  |  |  |
Pay-fixed interest rate swap [Member] | Interest Rate Swap [Member] | Interest Rate Swap Agreements, Maturities in Next 109-120 Months [Member] |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
End of period notional amount | $ 585,000 |  |  | $ 585,000 |  |  |  |
Weighted-average Fixed Pay Rate | 2.72% |  |  | 2.72% |  |  |  |
Weighted-average Fixed Receive Rate | 2.72% |  |  | 2.72% |  |  |  |
[1] | The Eurodollar futures aggregate notional amount represents the total notional of the 3-month contracts with expiration dates from 2017 to 2020. The maximum notional outstanding for any future 3-month period did not exceed $725,000 as of September 30, 2015
[2] | The Eurodollar futures aggregate notional amount represents the total notional of the 3-month contracts with expiration dates from 2015 to 2020. The maximum notional outstanding for any future 3-month period did not exceed $1,300,000 as of December 31, 2014.

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