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Derivatives (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended |
--- | --- | ---
Mar. 31, 2014 | Mar. 31, 2013 | Dec. 31, 2013
Derivative [Line Items] |  |  |
Derivative Liability, Fair Value, Gross Liability | $ 11,137 |  | $ 6,681
Derivative assets | 12,064 |  | 18,488
Derivative Liabilities | (11,137) |  | (6,681)
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, 2013$790,000 $9,000,000Additions75,000 —Settlements, terminations, or expirations(15,000) —Notional amount as of March 31, 2014(1)$850,000 $9,000,000(1)The Eurodollar futures notional amount as of March 31, 2014 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. |  |
Loss on derivative instruments, net | (13,422) | (17) |
Not Designated as Hedging Instrument [Member] |  |  |
Derivative [Line Items] |  |  |
Derivative assets | 12,064 |  | 18,488
Derivative Asset, Notional Amount | 525,000 |  | 575,000
Derivative Liabilities | (11,137) |  | (6,681)
Derivative Liability, Notional Amount | 9,325,000 |  | 9,215,000
Interest Rate Swap [Member] |  |  |
Derivative [Line Items] |  |  |
Derivative, Notional Amount |  |  | 790,000
Gain (Loss) on Derivative Instruments Held for Trading Purposes, Net | (9,008) | (17) |
Weighted-average Fixed Rate Swapped | 1.61% |  |
Interest Rate Swap [Member] | Not Designated as Hedging Instrument [Member] |  |  |
Derivative [Line Items] |  |  |
Derivative Instruments Not Designated as Hedging Instruments, Liability, at Fair Value | (1,378) |  | (1,336)
Derivative Liability, Notional Amount | 325,000 |  | 215,000
Derivative, Notional Amount | 850,000 |  |
Eurodollar Future [Member] |  |  |
Derivative [Line Items] |  |  |
Derivative, Notional Amount |  |  | 9,000,000
Notional Amount of Derivative Instruments Added | 0 |  |
Notional Amount of Derivative Instruments Terminated | 0 |  |
Gain (Loss) on Derivative Instruments Held for Trading Purposes, Net | (4,414) | 0 |
Eurodollar Future [Member] | Not Designated as Hedging Instrument [Member] |  |  |
Derivative [Line Items] |  |  |
Derivative Instruments Not Designated as Hedging Instruments, Liability, at Fair Value | (9,759) |  | (5,345)
Derivative Liability, Notional Amount | 9,000,000 |  | 9,000,000
Derivative, Notional Amount | 9,000,000 |  |
Interest Rate Swap Agreements, Maturities in Next 37-48 Months [Member] | Interest Rate Swap [Member] |  |  |
Derivative [Line Items] |  |  |
Derivative, Notional Amount | 185,000 |  |
Weighted-average Fixed Rate Swapped | 0.92% |  |
Interest Rate Swap Agreements, Maturities in Next 49-60 Months [Member] | Interest Rate Swap [Member] |  |  |
Derivative [Line Items] |  |  |
Derivative, Notional Amount | 350,000 |  |
Weighted-average Fixed Rate Swapped | 1.62% |  |
Interest Rate Swap Agreements, Maturities in Next 61-72 Months [Member] | Interest Rate Swap [Member] |  |  |
Derivative [Line Items] |  |  |
Derivative, Notional Amount | 35,000 |  |
Weighted-average Fixed Rate Swapped | 1.24% |  |
Interest Rate Swap Agreements, Maturities in Next 73-84 Months [Member] | Interest Rate Swap [Member] |  |  |
Derivative [Line Items] |  |  |
Derivative, Notional Amount | 100,000 |  |
Weighted-average Fixed Rate Swapped | 2.08% |  |
Interest Rate Swap Agreements, Maturities in Next 109-127 Months [Member] | Interest Rate Swap [Member] |  |  |
Derivative [Line Items] |  |  |
Derivative, Notional Amount | 180,000 |  |
Weighted-average Fixed Rate Swapped | 2.13% |  |
Interest Rate Swap [Member] |  |  |
Derivative [Line Items] |  |  |
Notional Amount of Derivative Instruments Added | 75,000 |  |
Notional Amount of Derivative Instruments Terminated | $ 15,000 |  |

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- Definition Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13433-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13495-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=20225523&loc=SL20225862-175312 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=28370219&loc=SL20226008-175313 + Details
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- Definition Information that would enable users to understand the volume of the entity's derivative activity. + 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=7476318&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=7476318&loc=SL5579245-113959 + Details
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