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Derivatives (Details) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2012 Derivatives | Dec. 31, 2011
--- | --- | ---
Derivatives, Fair Value [Line Items] |  |
Weighted-average Fixed Rate Swapped | 1.62% |
Notional Amount | $ 275,000 |
Interest rate swap [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Weighted-average Fixed Rate Swapped | 1.53% |
Fair Value | (46,496) | (27,997)
Derivative Liability, Number of Instruments Held | 7 |
Notional Amount | 1,512,000 |
Number of Swaps | 42 |
Interest rate swap [Member] | 0-12 months [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Weighted-average Fixed Rate Swapped | 1.30% |
Notional Amount | 75,000 |
Number of Swaps | 2 |
Interest rate swap [Member] | 13-36 months [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Weighted-average Fixed Rate Swapped | 1.44% |
Notional Amount | 565,000 |
Number of Swaps | 10 |
Interest rate swap [Member] | 37-60 months [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Weighted-average Fixed Rate Swapped | 1.60% |
Notional Amount | 472,000 |
Number of Swaps | 16 |
Interest rate swap [Member] | Over 60 months [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Weighted-average Fixed Rate Swapped | 1.60% |
Notional Amount | 400,000 |
Number of Swaps | 14 |
Interest rate swap [Member] | Hedging instrument [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Cumulative Notional Amount | 1,485,000 | 1,065,000
Weighted-average Fixed Rate Swapped | 1.50% | 1.55%
Fair Value | (43,802) | (25,512)
Notional Amount | 1,485,000 |
Interest rate swap [Member] | Hedging instrument [Member] | 0-12 months [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Notional Amount | 75,000 |
Interest rate swap [Member] | Hedging instrument [Member] | 13-36 months [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Notional Amount | 565,000 |
Interest rate swap [Member] | Hedging instrument [Member] | 37-60 months [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Notional Amount | 445,000 |
Interest rate swap [Member] | Hedging instrument [Member] | Over 60 months [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Notional Amount | 400,000 |
Interest rate swap [Member] | Designated as Trading [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Cumulative Notional Amount |  | 27,000
Weighted-average Fixed Rate Swapped | 2.88% | 2.88%
Fair Value | (2,694) | (2,485)
Notional Amount | 27,000 |
Interest rate swap [Member] | Designated as Trading [Member] | 0-12 months [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Notional Amount | 0 |
Interest rate swap [Member] | Designated as Trading [Member] | 13-36 months [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Notional Amount | 0 |
Interest rate swap [Member] | Designated as Trading [Member] | 37-60 months [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Cumulative Notional Amount | 27,000 |
Interest rate swap [Member] | Designated as Trading [Member] | Over 60 months [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Notional Amount | $ 0 |

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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 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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