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Derivatives (Details) (Interest rate swap [Member], USD $) In Thousands, unless otherwise specified | Jun. 30, 2012 Derivatives | Dec. 31, 2011
--- | --- | ---
Derivatives, Fair Value [Line Items] |  |
Derivative Liability, Number of Instruments Held | 7 |
Fair Value | $ (39,267) | $ (27,997)
Derivative liabilities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Notional Amount | 1,512,000 |
Number of Swaps | 42 |
Weighted-average Fixed Rate Swapped | 1.53% |
Derivative liabilities [Member] | 0-12 months [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Notional Amount | 75,000 |
Number of Swaps | 2 |
Weighted-average Fixed Rate Swapped | 1.30% |
Derivative liabilities [Member] | 13-36 months [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Notional Amount | 565,000 |
Number of Swaps | 10 |
Weighted-average Fixed Rate Swapped | 1.44% |
Derivative liabilities [Member] | 37-60 months [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Notional Amount | 287,000 |
Number of Swaps | 11 |
Weighted-average Fixed Rate Swapped | 2.04% |
Derivative liabilities [Member] | Over 60 months [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Notional Amount | 585,000 |
Number of Swaps | 19 |
Weighted-average Fixed Rate Swapped | 1.39% |
Hedging instrument [Member] | Derivative liabilities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Fair Value | (36,551) | (25,512)
Cumulative Notional Amount | 1,485,000 | 1,065,000
Notional Amount | 1,485,000 |
Weighted-average Fixed Rate Swapped | 1.50% | 1.55%
Hedging instrument [Member] | Derivative liabilities [Member] | 0-12 months [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Notional Amount | 75,000 |
Hedging instrument [Member] | Derivative liabilities [Member] | 13-36 months [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Notional Amount | 565,000 |
Hedging instrument [Member] | Derivative liabilities [Member] | 37-60 months [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Notional Amount | 260,000 |
Hedging instrument [Member] | Derivative liabilities [Member] | Over 60 months [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Notional Amount | 585,000 |
Trading instrument [Member] | Derivative liabilities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Fair Value | (2,716) | (2,485)
Cumulative Notional Amount |  | 27,000
Notional Amount | 27,000 |
Weighted-average Fixed Rate Swapped | 2.88% | 2.88%
Trading instrument [Member] | Derivative liabilities [Member] | 0-12 months [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Notional Amount | 0 |
Trading instrument [Member] | Derivative liabilities [Member] | 13-36 months [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Notional Amount | 0 |
Trading instrument [Member] | Derivative liabilities [Member] | 37-60 months [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Cumulative Notional Amount | 27,000 |
Trading instrument [Member] | Derivative liabilities [Member] | Over 60 months [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Notional Amount | 0 |
Forward Contracts [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Cumulative Notional Amount | 275,000 |
Weighted-average Fixed Rate Swapped | 1.62% |
Forward Contracts, March 25, 2013 Start Date [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Cumulative Notional Amount | 100,000 |
Weighted-average Fixed Rate Swapped | 1.89% |
Forward Contracts, April 15, 2013 Start Date [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Cumulative Notional Amount | 25,000 |
Weighted-average Fixed Rate Swapped | 1.70% |
Forward Contracts, January 8, 2013 Start Date [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Cumulative Notional Amount | $ 150,000 |
Weighted-average Fixed Rate Swapped | 0.77% |

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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 Average fixed interest rate related to the group of interest rate derivatives. + References No definition available. + Details
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- Definition Fair value of derivative liability, presented on a gross basis even when the derivative instrument is subject to master netting arrangements and qualifies for net presentation in the statement of financial position. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 205G -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 44C -Subparagraph a -Clause 1 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (a),(c) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624163-113959 + Details
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- Definition Fair value of the gross liabilities less the gross assets of a derivative liability or group of derivative liabilities. + References Reference 1: 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 2: 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=7491637&loc=d3e13433-108611 Reference 3: 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 4: 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=7491637&loc=d3e13495-108611 + Details
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- Definition Total monetary amount specified by the derivative liability (or liabilities). Expressed as an absolute value. + References Reference 1: 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Notional Amount -URI http://asc.fasb.org/extlink&oid=6519104 Reference 3: 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 + Details
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- Definition The number of derivative instruments of a particular derivative liability or group of derivative liabilities held by the entity. + References Reference 1: 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 Reference 2: 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 + Details
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