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Derivatives (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended |  |  |  | 3 Months Ended | 12 Months Ended |  | 3 Months Ended | 12 Months Ended |  | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2012 Hedging instrument [Member] | Dec. 31, 2013 Not Designated as Hedging Instrument [Member] | Dec. 31, 2012 Not Designated as Hedging Instrument [Member] | Mar. 31, 2011 Interest Rate Swap [Member] | Dec. 31, 2013 Interest Rate Swap [Member] | Dec. 31, 2012 Interest Rate Swap [Member] | Dec. 31, 2013 Interest Rate Swap [Member] Not Designated as Hedging Instrument [Member] | Mar. 31, 2011 Eurodollar Future [Member] | Dec. 31, 2013 Eurodollar Future [Member] | Dec. 31, 2012 Eurodollar Future [Member] | Dec. 31, 2013 Eurodollar Future [Member] Not Designated as Hedging Instrument [Member] | Dec. 31, 2013 Forward Contracts [Member] | Dec. 31, 2013 Interest Rate Swap Agreements, Maturities in Next 37-48 Months [Member] Interest Rate Swap [Member] | Dec. 31, 2013 Interest Rate Swap Agreements, Maturities in Next 49-60 Months [Member] Interest Rate Swap [Member] | Dec. 31, 2013 Interest Rate Swap Agreements, Maturities in Next 61-72 Months [Member] Interest Rate Swap [Member] | Dec. 31, 2013 Interest Rate Swap Agreements, Maturities in Next 73-84 Months [Member] Interest Rate Swap [Member] | Dec. 31, 2013 Interest Rate Swap Agreements, Maturities in Next 109-127 Months [Member] Interest Rate Swap [Member] | Dec. 31, 2013 Interest Rate Swap [Member]
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative assets | $ 18,488 | $ 0 |  |  | $ 18,488 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative Asset, Notional Amount |  |  |  |  | 575,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative Instruments Not Designated as Hedging Instruments, Liability, at Fair Value |  |  |  |  |  | (2,724) |  |  |  | 1,336 |  |  |  | (5,345) |  |  |  |  |  |  |
Derivative Liabilities | 6,681 | 42,537 |  |  | (6,681) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative Liability, Notional Amount |  | 1,462,000 |  | 1,435,000 | 9,215,000 | 27,000 |  |  |  | 215,000 |  |  |  | 9,000,000 |  |  |  |  |  |  |
Cash Flow Hedge Derivative Instrument Liabilities at Fair Value |  |  |  | (39,813) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative, Notional Amount |  |  |  |  |  |  |  |  | 1,462,000 | 790,000 |  |  | 0 | 9,000,000 | 150,000 | 185,000 | 15,000 | 385,000 | 25,000 | 180,000 |
Description of Derivative Activity Volume | The following table summarizes activity related to derivative instruments for the periods indicated:(amounts in thousands)Interest Rate Swaps Eurodollar FuturesNotional amount as of December 31, 2012:$1,462,000 $—Additions:380,000 20,250,000Settlements, terminations, or expirations:(1,052,000) (11,250,000)Notional amount as of December 31, 2013:(1)$790,000 $9,000,000(1)The Eurodollar futures notional amount as of December 31, 2013 represents the total notional of the 3-month contracts with expiration dates from 2016 to 2020. The maximum notional outstanding for any future 3-month period does not exceed $1,175,000. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional Amount of Derivative Instruments Added |  |  |  |  |  |  |  |  |  |  |  | 20,250,000 |  |  |  |  |  |  |  |  | 380,000
Notional Amount of Derivative Instruments Terminated |  |  |  |  |  |  |  |  |  |  |  | (11,250,000) |  |  |  |  |  |  |  |  | 1,052,000
Gain (Loss) on Derivative Instruments Held for Trading Purposes, Net |  |  |  |  |  |  | (2,825) | 9,315 | (908) |  | 0 | (19,391) | 0 |  |  |  |  |  |  |  |
Loss on derivative instruments, net | $ (10,076) | $ (908) | $ (2,825) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted-average Fixed Rate Swapped |  |  |  |  |  |  |  | 1.56% |  |  |  |  |  |  | 2.17% | 0.92% | 2.17% | 1.58% | 1.61% | 2.13% |

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