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)