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Derivatives (Details 2) (Series F Preferred Stock [Member], USD $) In Thousands, unless otherwise specified | Mar. 31, 2012 | Dec. 31, 2011
--- | --- | ---
Fair value liabilities measured on recurring basis |  |
Fair Value of Liabilities | $ (1,251) | $ (1,667)
Fair Value, Measurements, Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |
Fair value liabilities measured on recurring basis |  |
Fair Value of Liabilities |  |
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |
Fair value liabilities measured on recurring basis |  |
Fair Value of Liabilities |  |
Fair Value, Measurements, Recurring [Member] | Unobservable Inputs (Level 3) [Member] |  |
Fair value liabilities measured on recurring basis |  |
Fair Value of Liabilities | $ (1,251) | $ (1,667)

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- Details
Name: | us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition This element represents the aggregate of the liabilities reported on the balance sheet at period end measured at fair value by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. + References No definition available. + Details
Name: | us-gaap_LiabilitiesFairValueDisclosure
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant