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Derivatives (Details 3) (USD $) In Thousands, unless otherwise specified |  |  | 3 Months Ended
--- | --- | --- | ---
Mar. 31, 2012 | Dec. 31, 2011 | Mar. 31, 2012 Series F Agreement [Member] | Mar. 31, 2012 Series F Agreement [Member] Long Dated Treasuries [Member] | Mar. 31, 2012 Series F Agreement [Member] Own Credit Risk [Member] | Mar. 31, 2012 Discounted Cash Flow [Member] Series F Agreement [Member]
Quantitative information about the Level 3 fair value measurements |  |  |  |  |  |
Fair value measurements | $ 1,251 | $ 1,667 | $ (1,251) |  |  |
Fair Value Measurements, Valuation Technique |  |  |  |  |  | Discounted Cash Flow
Fair Value Measurements, Unobservable Inputs |  |  |  | Long Dated Treasuries (A) | Own Credit Risk (B) |
Fair Value Measurements, Range, Minimum Percentage |  |  | 3.32% |  | 1.51% |
Fair Value Measurements, Range, Maximum Percentage |  |  | 3.58% |  | 2.85% |

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- Definition Fair value liabilities measured on recurring basis with unobservable inputs percentage maximum. + References No definition available. + Details
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- Definition Fair value liabilities measured on recurring basis with unobservable inputs percentage minimum. + References No definition available. + Details
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- Definition This element represents, the inputs and valuation technique(s) used to measure fair value and a discussion of changes in valuation techniques and related inputs, if any, during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 157 -Paragraph 32 -Subparagraph e -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=6925170&loc=d3e19207-110258 + Details
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- Definition This element represents a liability measured at fair value using significant unobservable inputs (Level 3) which is required for reconciliation purposes of beginning and ending balances. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6925170&loc=d3e19207-110258 + Details
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