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Derivatives (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2014 | Jun. 30, 2013 | Dec. 31, 2013
Derivative [Line Items] |  |  |  |  |
Derivative liabilities, fair value | $ (23,974) |  | $ (23,974) |  | $ (6,681)
Gain (loss) on derivative instruments, net | (23,074) | 11,353 | (36,496) | 11,336 |
Not Designated as Hedging Instrument [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Derivative liabilities, aggregate notional amount | 11,810,000 |  | 11,810,000 |  | 9,215,000
Interest Rate Swap [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Derivative assets, fair value | 5,237 |  | 5,237 |  | 18,488
Derivative liabilities, fair value | (2,835) |  | (2,835) |  | (1,336)
Notional amount of derivative instruments added |  |  | 75,000 |  |
Derivatives, notional amount | 700,000 |  | 700,000 |  |
Weighted-average Fixed Rate Swapped | 1.57% |  | 1.57% |  |
Gain (loss) on derivative instruments, net | (11,694) | 11,353 | (20,702) | 11,336 |
Interest Rate Swap [Member] | Not Designated as Hedging Instrument [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Derivative assets, aggregate notional amount | 290,000 |  | 290,000 |  | 575,000
Derivative liabilities, aggregate notional amount | 410,000 |  | 410,000 |  | 215,000
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 Rate Swapped | 0.92% |  | 0.92% |  |
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 Rate Swapped | 1.45% |  | 1.45% |  |
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 Rate Swapped | 1.61% |  | 1.61% |  |
Interest Rate Swap [Member] | Interest Rate Swap Agreements, Maturities in Next 73-84 Months [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Derivatives, notional amount | 75,000 |  | 75,000 |  |
Weighted-average Fixed Rate Swapped | 2.24% |  | 2.24% |  |
Interest Rate Swap [Member] | Interest Rate Swap Agreements, Maturities in Next 85-108 Months [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Derivatives, notional amount | 30,000 |  | 30,000 |  |
Weighted-average Fixed Rate Swapped | 1.93% |  | 1.93% |  |
Interest Rate Swap [Member] | Interest Rate Swap Agreements, Maturities in Next 109-127 Months [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Derivatives, notional amount | 150,000 |  | 150,000 |  |
Weighted-average Fixed Rate Swapped | 2.17% |  | 2.17% |  |
Eurodollar Future [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Derivative liabilities, fair value | (21,139) |  | (21,139) |  | (5,345)
Notional amount of derivative instruments added |  |  | 2,400,000 |  |
Gain (loss) on derivative instruments, net | (11,380) | 0 | (15,794) | 0 |
Eurodollar Future [Member] | Not Designated as Hedging Instrument [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Derivative liabilities, aggregate notional amount | 11,400,000 |  | 11,400,000 |  | 9,000,000
Interest Rate Swap [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional amount of derivative instruments terminated |  |  | $ (165,000) |  |

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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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