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Derivatives (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 | Sep. 30, 2012 | Dec. 31, 2012
Derivative [Line Items] |  |  |  |  |
Derivative Instruments Not Designated as Hedging Instruments, Asset, at Fair Value | $ 12,908 |  | $ 12,908 |  |
Description of Derivative Activity Volume |  |  | Information related to the volume of activity for our interest rate derivative instruments subsequent to December 31, 2012 is as follows:(amounts in thousands)Interest Rate Swaps Eurodollar FuturesNotional amount as of December 31, 2012:$1,462,000 $—Additions:380,000 22,100,000Settlements, terminations, or expirations:(150,000) (1,850,000)Notional amount as of September 30, 2013:(1)$1,692,000 $20,250,000(1)The Eurodollar futures notional amount as of September 30, 2013 represents the total notional of the 3-month contracts with expiration dates from 2013 to 2020. The maximum notional outstanding for any 3-month period does not exceed $1,275,000. |  |
Gain on derivative instruments, net | (24,019) | (333) | (12,683) | (907) |
Derivative Liability, Notional Amount | 21,517,000 |  | 21,517,000 |  | 1,462,000
Derivative Liabilities | (20,837) |  | (20,837) |  | (42,537)
Interest Rate Swap [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional Amount of Derivative Instruments Added |  |  | 380,000 |  |
Notional Amount of Derivative Instruments Terminated |  |  | (150,000) |  |
Eurodollar Future [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional Amount of Derivative Instruments Added |  |  | 22,100,000 |  |
Notional Amount of Derivative Instruments Terminated |  |  | (1,850,000) |  |
Interest Rate Swap [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Gain (Loss) on Derivative Instruments Held for Trading Purposes, Net | (6,225) | (333) | 5,111 | (907) |
Derivative Liability, Notional Amount |  |  |  |  | 1,462,000
Weighted-average Fixed Rate Swapped | 1.64% |  | 1.64% |  |
Interest Rate Swap [Member] | Hedging instrument [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Cash Flow Hedge Derivative Instrument Liabilities at Fair Value |  |  |  |  | (39,813)
Derivative Liability, Notional Amount |  |  |  |  | 1,435,000
Interest Rate Swap [Member] | Not Designated as Hedging Instrument [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Derivative Instruments Not Designated as Hedging Instruments, Asset, at Fair Value | 12,908 |  | 12,908 |  |
Derivative Asset, Notional Amount | 425,000 |  | 425,000 |  |
Derivative Instruments Not Designated as Hedging Instruments, Liability, at Fair Value | (20,837) |  | (20,837) |  | (2,724)
Derivative Liability, Notional Amount | 1,267,000 |  | 1,267,000 |  | 27,000
Derivative, Notional Amount | 1,692,000 |  | 1,692,000 |  |
Eurodollar Future [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Gain (Loss) on Derivative Instruments Held for Trading Purposes, Net | (17,794) | 0 | (17,794) | 0 |
Eurodollar Future [Member] | Not Designated as Hedging Instrument [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Derivative Liability, Notional Amount | 20,250,000 |  | 20,250,000 |  |
Derivative, Notional Amount | 20,250,000 |  | 20,250,000 |  |
Forward Contracts [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Derivative, Notional Amount | 150,000 |  | 150,000 |  |
Weighted-average Fixed Rate Swapped | 2.17% |  | 2.17% |  |
0-12 months [Member] | Interest Rate Swap [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Derivative, Notional Amount | 435,000 |  | 435,000 |  |
Weighted-average Fixed Rate Swapped | 1.26% |  | 1.26% |  |
Interest Rate Swap Agreements, Maturities in Next 13-24 Months [Member] [Member] | Interest Rate Swap [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Derivative, Notional Amount | 130,000 |  | 130,000 |  |
Weighted-average Fixed Rate Swapped | 2.06% |  | 2.06% |  |
Interest Rate Swap Agreements, Maturities in Next 25-36 Months [Member] | Interest Rate Swap [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Derivative, Notional Amount | 260,000 |  | 260,000 |  |
Weighted-average Fixed Rate Swapped | 1.96% |  | 1.96% |  |
Interest Rate Swap Agreements, Maturities in Next 37-48 Months [Member] | Interest Rate Swap [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Derivative, Notional Amount | 212,000 |  | 212,000 |  |
Weighted-average Fixed Rate Swapped | 0.01% |  | 0.01% |  |
Interest Rate Swap Agreements, Maturities in Next 49-60 Months [Member] | Interest Rate Swap [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Derivative, Notional Amount | 15,000 |  | 15,000 |  |
Weighted-average Fixed Rate Swapped | 2.17% |  | 2.17% |  |
Interest Rate Swap Agreements, Maturities in Next 61-72 Months [Member] | Interest Rate Swap [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Derivative, Notional Amount | 385,000 |  | 385,000 |  |
Weighted-average Fixed Rate Swapped | 1.58% |  | 1.58% |  |
Interest Rate Swap Agreements, Maturities in Next 73-84 Months [Member] | Interest Rate Swap [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Derivative, Notional Amount | 25,000 |  | 25,000 |  |
Weighted-average Fixed Rate Swapped | 1.61% |  | 1.61% |  |
Interest Rate Swap Agreements, Maturities in Next 109-127 Months [Member] | Interest Rate Swap [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Derivative, Notional Amount | $ 230,000 |  | $ 230,000 |  |
Weighted-average Fixed Rate Swapped | 2.27% |  | 2.27% |  |

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