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Warrants And Derivative Liabilities (Schedule Of The Fair Value Of The Warrants Using The Black-Scholes Option Pricing Model - Securities Agreement) (Details) (USD $)
In Millions, unless otherwise specified
 0 Months Ended 3 Months Ended
Apr. 04, 2012
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Derivative [Line Items]          
Risk-free interest rate 0.44% 0.20% 0.23% 0.23% 0.33%
Expected annual dividend yield 15.00% 16.50% 16.50% 15.00% 16.00%
Expected volatility 75.00% 66.90% 73.50% 70.00% 71.00%
Term (years) 2 years 6 months 1 year 6 months 4 days 1 year 9 months 4 days 2 years 4 days 2 years 3 months 11 days
Securities Purchase Agreement [Member]
          
Derivative [Line Items]          
Risk-free interest rate 1.19% 0.67% 0.75% 0.63% 0.77%
Expected annual dividend yield 0.00% 0.00% 0.00% 0.00% 0.00%
Expected volatility 80.00% 71.70% 80.60% 80.90% 80.80%
Term (years) 5 years 6 months 4 years 6 months 4 days 4 years 9 months 4 days 5 years 4 days 5 years 3 months 11 days
Fair Value 7.0 3.4 4.4 7.1 8.6