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Derivatives (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013 | Dec. 31, 2013
Derivative [Line Items] |  |  |  |  |  |  |  |
Derivative assets, fair value | $ 7,297 |  |  | $ 7,297 |  |  | $ 18,488 |
Derivative liabilities, fair value | (18,058) |  |  | (18,058) |  |  | (6,681) |
Notional amount of derivative instruments added |  |  |  | 7,950,000 |  |  |  |
Notional amount of derivative instruments terminated |  |  |  | (190,000) |  |  |  |
Derivatives, notional amount | 17,550,000 |  |  | 17,550,000 |  |  | 9,790,000 |
Gain (loss) on derivative instruments, net | 4,842 |  | (24,019) | (31,654) |  | (12,683) |  |
Not Designated as Hedging Instrument [Member] |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Derivative assets, aggregate notional amount | 4,700,000 |  |  | 4,700,000 |  |  | 575,000 |
Derivative liabilities, aggregate notional amount | 12,850,000 |  |  | 12,850,000 |  |  | 9,215,000 |
Interest Rate Swap [Member] |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Derivative assets, fair value | 6,958 |  |  | 6,958 |  |  | 18,488 |
Derivative liabilities, fair value | (437) |  |  | (437) |  |  | (1,336) |
Interest Rate Swap [Member] | Not Designated as Hedging Instrument [Member] |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Derivative assets, aggregate notional amount | 800,000 |  |  | 800,000 |  |  | 575,000 |
Derivative liabilities, aggregate notional amount | 150,000 |  |  | 150,000 |  |  | 215,000 |
Eurodollar Future [Member] |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Derivative assets, fair value | 339 |  |  | 339 |  |  |  |
Derivative liabilities, fair value | (17,621) |  |  | (17,621) |  |  | (5,345) |
Notional amount of derivative instruments added |  |  |  | 7,600,000 |  |  |  |
Notional amount of derivative instruments terminated |  |  |  | 0 |  |  |  |
Derivatives, notional amount | 16,600,000 |  |  | 16,600,000 |  |  | 9,000,000 |
Gain (loss) on derivative instruments, net | 3,857 |  | (17,794) | (11,937) |  | (17,794) |  |
Eurodollar Future [Member] | Not Designated as Hedging Instrument [Member] |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Derivative assets, aggregate notional amount | 3,900,000 | [1] |  | 3,900,000 | [1] |  |  |
Derivative liabilities, aggregate notional amount | 12,700,000 | [1] |  | 12,700,000 | [1] |  | 9,000,000 | [1]
Long [Member] | Interest Rate Swap [Member] |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Notional amount of derivative instruments added |  |  |  | 275,000 |  |  |  |
Notional amount of derivative instruments terminated |  |  |  | 0 |  |  |  |
Derivatives, notional amount | 275,000 |  |  | 275,000 |  |  | 0 |
Gain (loss) on derivative instruments, net | 339 |  | 0 | 339 |  | 0 |  |
Long [Member] | Interest Rate Swap [Member] | Interest Rate Swap Agreements, Maturities in Next 37-48 Months [Member] |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Derivatives, notional amount | 0 |  |  | 0 |  |  |  |
Weighted-average Fixed Pay Rate | 0.00% |  |  | 0.00% |  |  |  |
Weighted-average Fixed Receive Rate | 0.00% |  |  | 0.00% |  |  |  |
Long [Member] | Interest Rate Swap [Member] | Interest Rate Swap Agreements, Maturities in Next 49-60 Months [Member] |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Derivatives, notional amount | 250,000 |  |  | 250,000 |  |  |  |
Weighted-average Fixed Pay Rate | 2.00% |  |  | 2.00% |  |  |  |
Weighted-average Fixed Receive Rate | 2.00% |  |  | 2.00% |  |  |  |
Long [Member] | Interest Rate Swap [Member] | Interest Rate Swap Agreements, Maturities in Next 61-72 Months [Member] |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Derivatives, notional amount | 0 |  |  | 0 |  |  |  |
Weighted-average Fixed Pay Rate | 0.00% |  |  | 0.00% |  |  |  |
Weighted-average Fixed Receive Rate | 0.00% |  |  | 0.00% |  |  |  |
Long [Member] | Interest Rate Swap [Member] | Interest Rate Swap Agreements, Maturities in Next 73-84 Months [Member] |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Derivatives, notional amount | 0 |  |  | 0 |  |  |  |
Weighted-average Fixed Pay Rate | 0.00% |  |  | 0.00% |  |  |  |
Weighted-average Fixed Receive Rate | 0.00% |  |  | 0.00% |  |  |  |
Long [Member] | Interest Rate Swap [Member] | Interest Rate Swap Agreements, Maturities in Next 97-108 Months [Member] |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Derivatives, notional amount | 0 |  |  | 0 |  |  |  |
Weighted-average Fixed Pay Rate | 0.00% |  |  | 0.00% |  |  |  |
Weighted-average Fixed Receive Rate | 0.00% |  |  | 0.00% |  |  |  |
Long [Member] | Interest Rate Swap [Member] | Interest Rate Swap Agreements, Maturities in Next 109-120 Months [Member] |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Derivatives, notional amount | 25,000 |  |  | 25,000 |  |  |  |
Weighted-average Fixed Pay Rate | 3.00% |  |  | 3.00% |  |  |  |
Weighted-average Fixed Receive Rate | 3.00% |  |  | 3.00% |  |  |  |
Short [Member] | Interest Rate Swap [Member] |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Notional amount of derivative instruments added |  |  |  | 75,000 |  |  |  |
Notional amount of derivative instruments terminated |  |  |  | (190,000) |  |  |  |
Derivatives, notional amount | 675,000 |  |  | 675,000 |  |  | 790,000 |
Gain (loss) on derivative instruments, net | 646 |  | (6,225) | (20,056) |  | 5,111 |  |
Short [Member] | Interest Rate Swap [Member] | Interest Rate Swap Agreements, Maturities in Next 37-48 Months [Member] |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Derivatives, notional amount | 185,000 |  |  | 185,000 |  |  |  |
Weighted-average Fixed Pay Rate | 0.92% |  |  | 0.92% |  |  |  |
Weighted-average Fixed Receive Rate | 0.92% |  |  | 0.92% |  |  |  |
Short [Member] | Interest Rate Swap [Member] | Interest Rate Swap Agreements, Maturities in Next 49-60 Months [Member] |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Derivatives, notional amount | 235,000 |  |  | 235,000 |  |  |  |
Weighted-average Fixed Pay Rate | 1.45% |  |  | 1.45% |  |  |  |
Weighted-average Fixed Receive Rate | 1.45% |  |  | 1.45% |  |  |  |
Short [Member] | Interest Rate Swap [Member] | Interest Rate Swap Agreements, Maturities in Next 61-72 Months [Member] |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Derivatives, notional amount | 25,000 |  |  | 25,000 |  |  |  |
Weighted-average Fixed Pay Rate | 1.61% |  |  | 1.61% |  |  |  |
Weighted-average Fixed Receive Rate | 1.61% |  |  | 1.61% |  |  |  |
Short [Member] | Interest Rate Swap [Member] | Interest Rate Swap Agreements, Maturities in Next 73-84 Months [Member] |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Derivatives, notional amount | 50,000 |  |  | 50,000 |  |  |  |
Weighted-average Fixed Pay Rate | 2.20% |  |  | 2.20% |  |  |  |
Weighted-average Fixed Receive Rate | 2.20% |  |  | 2.20% |  |  |  |
Short [Member] | Interest Rate Swap [Member] | Interest Rate Swap Agreements, Maturities in Next 97-108 Months [Member] |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Derivatives, notional amount | 30,000 |  |  | 30,000 |  |  |  |
Weighted-average Fixed Pay Rate | 1.93% |  |  | 1.93% |  |  |  |
Weighted-average Fixed Receive Rate | 1.93% |  |  | 1.93% |  |  |  |
Short [Member] | Interest Rate Swap [Member] | Interest Rate Swap Agreements, Maturities in Next 109-120 Months [Member] |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Derivatives, notional amount | $ 150,000 |  |  | $ 150,000 |  |  |  |
Weighted-average Fixed Pay Rate | 2.17% |  |  | 2.17% |  |  |  |
Weighted-average Fixed Receive Rate | 2.17% |  |  | 2.17% |  |  |  |
[1] | 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 September 30, 2014 and $1,175,000 as of December 31, 2013.

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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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- Definition Nominal or face amount used to calculate payments on the derivative asset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5580258-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5579245-113959 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Notional Amount -URI http://asc.fasb.org/extlink&oid=6519104 + Details
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